タイトル通り、ソーシャルボタン プラグイン更新できないです。
エラー
１、エラーログに何も記載していません。
ーーーーーーーーーーー
アップデート確認
システムエラーが発生しました。

ログを確認
**************** Disable ****************
**************** Upgrade ***************
２、EC－CUBEはメンテナンスモードに自動変更されました。
３、ソーシャルボタンプラグインのステータスは無効になりました。
４、２と３のままで、再度アップデートしたら、エラーログは下記通りです。
<warning>Deprecation warning: require.ec-cube/ECCUBE4LineLoginIntegration is invalid, it should not contain uppercase characters. Please use ec-cube/eccube4lineloginintegration instead. Make sure you fix this as Composer 2.0 will error.</warning>
<warning>Deprecation warning: require.ec-cube/FacebookAdsExtention is invalid, it should not contain uppercase characters. Please use ec-cube/facebookadsextention instead. Make sure you fix this as Composer 2.0 will error.</warning>
<warning>Deprecation warning: require.ec-cube/MGSocialButton is invalid, it should not contain uppercase characters. Please use ec-cube/mgsocialbutton instead. Make sure you fix this as Composer 2.0 will error.</warning>
<warning>Deprecation warning: require.ec-cube/Recommend4 is invalid, it should not contain uppercase characters. Please use ec-cube/recommend4 instead. Make sure you fix this as Composer 2.0 will error.</warning>
<warning>Deprecation warning: require.ec-cube/SlnPayment4 is invalid, it should not contain uppercase characters. Please use ec-cube/slnpayment4 instead. Make sure you fix this as Composer 2.0 will error.</warning>
<warning>Deprecation warning: require.ec-cube/YahooLoginIntegration4 is invalid, it should not contain uppercase characters. Please use ec-cube/yahoologinintegration4 instead. Make sure you fix this as Composer 2.0 will error.</warning>
<warning>Deprecation warning: require.ec-cube/YamatoPayment4 is invalid, it should not contain uppercase characters. Please use ec-cube/yamatopayment4 instead. Make sure you fix this as Composer 2.0 will error.</warning>
<warning>Deprecation warning: require-dev.mikey179/vfsStream is invalid, it should not contain uppercase characters. Please use mikey179/vfsstream instead. Make sure you fix this as Composer 2.0 will error.</warning>
[155.4MiB/2.72s] ./composer.json has been updated
[155.7MiB/3.19s] <warning>Deprecation warning: require.ec-cube/ECCUBE4LineLoginIntegration is invalid, it should not contain uppercase characters. Please use ec-cube/eccube4lineloginintegration instead. Make sure you fix this as Composer 2.0 will error.</warning>
[155.7MiB/3.19s] <warning>Deprecation warning: require.ec-cube/FacebookAdsExtention is invalid, it should not contain uppercase characters. Please use ec-cube/facebookadsextention instead. Make sure you fix this as Composer 2.0 will error.</warning>
[155.7MiB/3.19s] <warning>Deprecation warning: require.ec-cube/MGSocialButton is invalid, it should not contain uppercase characters. Please use ec-cube/mgsocialbutton instead. Make sure you fix this as Composer 2.0 will error.</warning>
[155.7MiB/3.19s] <warning>Deprecation warning: require.ec-cube/Recommend4 is invalid, it should not contain uppercase characters. Please use ec-cube/recommend4 instead. Make sure you fix this as Composer 2.0 will error.</warning>
[155.7MiB/3.19s] <warning>Deprecation warning: require.ec-cube/SlnPayment4 is invalid, it should not contain uppercase characters. Please use ec-cube/slnpayment4 instead. Make sure you fix this as Composer 2.0 will error.</warning>
[155.7MiB/3.19s] <warning>Deprecation warning: require.ec-cube/YahooLoginIntegration4 is invalid, it should not contain uppercase characters. Please use ec-cube/yahoologinintegration4 instead. Make sure you fix this as Composer 2.0 will error.</warning>
[155.7MiB/3.19s] <warning>Deprecation warning: require.ec-cube/YamatoPayment4 is invalid, it should not contain uppercase characters. Please use ec-cube/yamatopayment4 instead. Make sure you fix this as Composer 2.0 will error.</warning>
[155.7MiB/3.19s] <warning>Deprecation warning: require-dev.mikey179/vfsStream is invalid, it should not contain uppercase characters. Please use mikey179/vfsstream instead. Make sure you fix this as Composer 2.0 will error.</warning>
[159.4MiB/3.65s] <warning>Dependency "ec-cube/plugin-installer" is also a root requirement, but is not explicitly whitelisted. Ignoring.</warning>
[159.2MiB/3.65s] Loading composer repositories with package information
[159.8MiB/4.45s] Updating dependencies (including require-dev)
[513.9MiB/23.13s] Nothing to install or update
[482.6MiB/23.27s] <warning>Package phpunit/phpunit-mock-objects is abandoned, you should avoid using it. No replacement was suggested.</warning>
[482.6MiB/23.27s] <warning>Package symfony/lts is abandoned, you should avoid using it. Use symfony/flex instead.</warning>
[482.9MiB/23.29s] Writing lock file
[482.9MiB/23.29s] Generating optimized autoload files
[485.3MiB/29.80s] <warning>Warning: Ambiguous class resolution, "Eccube\Entity\Order" was found in both "$baseDir . '/app/proxy/entity/Order.php" and "/////src/Eccube/Entity/Order.php", the first will be used.</warning>
[483.4MiB/31.77s] Memory usage: 483.36MiB (peak: 576.35MiB), time: 31.77s

**************** Schema Update ****************

EC-cube側とプラグイン側、どちらの不具合か分かりません。
私のサーバー環境は駄目か分かりません。
必須プラグインではないですが、今後必須プラグインがスムーズに更新できるように報告いたします。

----------------
■ ECCUBEのバージョン：4系
■ サーバー名：さくらインターネット
■ データベース：MySQL/PHP7