Merge branch 'krille/update-provider' into 'main'

chore: Update provider package and remove dep override

See merge request famedly/fluffychat!995

pubspec.lock

@@ -1366,7 +1366,7 @@ packages:
       name: provider
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "5.0.0"
+    version: "6.0.3"
   pub_semver:
     dependency: transitive
     description:

pubspec.yaml

@@ -169,4 +169,3 @@ dependency_overrides:
     git:
       url: https://github.com/TheOneWithTheBraid/keyboard_shortcuts.git
       ref: null-safety
-  provider: 5.0.0