Update Flutter dependencies to latest versions

Upgraded battery_plus to 7.0.0, connectivity_plus to 7.0.0, device_info_plus to 12.3.0, and screen_brightness to 2.1.7 in packages/flet/pubspec.yaml. This ensures compatibility with the latest features and bug fixes from these packages.

Author: FeodorFitsner

client/pubspec.lock

@@ -85,10 +85,10 @@ packages:
     dependency: transitive
     description:
       name: battery_plus
-      sha256: "03d5a6bb36db9d2b977c548f6b0262d5a84c4d5a4cfee2edac4a91d57011b365"
+      sha256: ad16fcb55b7384be6b4bbc763d5e2031ac7ea62b2d9b6b661490c7b9741155bf
       url: "https://pub.dev"
     source: hosted
-    version: "6.2.3"
+    version: "7.0.0"
   battery_plus_platform_interface:
     dependency: transitive
     description:
@@ -149,10 +149,10 @@ packages:
     dependency: transitive
     description:
       name: connectivity_plus
-      sha256: b5e72753cf63becce2c61fd04dfe0f1c430cc5278b53a1342dc5ad839eab29ec
+      sha256: "33bae12a398f841c6cda09d1064212957265869104c478e5ad51e2fb26c3973c"
       url: "https://pub.dev"
     source: hosted
-    version: "6.1.5"
+    version: "7.0.0"
   connectivity_plus_platform_interface:
     dependency: transitive
     description:

packages/flet/pubspec.yaml

@@ -21,10 +21,10 @@ dependencies:
     sdk: flutter
   flutter_localizations:
     sdk: flutter
-  battery_plus: ^6.2.2
+  battery_plus: ^7.0.0
   collection: ^1.19.0
-  connectivity_plus: ^6.1.2
-  device_info_plus: ^12.1.0
+  connectivity_plus: ^7.0.0
+  device_info_plus: ^12.3.0
   equatable: ^2.0.3
   file_picker: ^10.3.3
   flutter_highlight: 0.7.0
@@ -38,7 +38,7 @@ dependencies:
   path_provider: ^2.1.5
   provider: ^6.1.2
   screenshot: ^3.0.0
-  screen_brightness: ^2.1.0
+  screen_brightness: ^2.1.7
   sensors_plus: ^7.0.0
   shared_preferences: 2.5.3
   share_plus: ^12.0.1