chore: upgrade to L9

BREAKING CHANGE: This commit updates the Laravel framework to version 9. Additionally, it also updates outdated and abandoned dependencies in the composer.json file.

The resources/lang directory has also been moved to the repository's root directory.

lang/vendor/log-viewer/ja.json

@@ -0,0 +1,13 @@
+{
+    "Date": "日付",
+    "The list of logs is empty!": "ログリストが空です!",
+    "All": "すべて",
+    "Emergency": "緊急",
+    "Alert": "警戒",
+    "Critical": "致命的",
+    "Error": "エラー",
+    "Warning": "警告",
+    "Notice": "通知",
+    "Info": "情報",
+    "Debug": "デバッグ"
+}