Upgrade to latest Flutter version (fix Gradle and other errors)

pubspec.yaml

@@ -1,6 +1,5 @@
 name: obtainium
 description: Get Android app updates straight from the source.
-
 # The following line prevents the package from being accidentally published to
 # pub.dev using `flutter pub publish`. This is preferred for private packages.
 publish_to: 'none' # Remove this line if you wish to publish to pub.dev
@@ -20,7 +19,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 version: 1.1.37+2294
 
 environment:
-  sdk: '>=3.0.0 <4.0.0'
+  sdk: ^3.6.0
 
 # Dependencies specify other packages that your package needs in order to work.
 # To automatically upgrade your package dependencies to the latest versions
@@ -32,7 +31,6 @@ dependencies:
   flutter:
     sdk: flutter
 
-
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.
   cupertino_icons: ^1.0.5
@@ -51,11 +49,14 @@ dependencies:
   device_info_plus: ^11.0.0
   file_picker: ^8.0.0+1
   animations: ^2.0.4
-  android_package_installer:
+  android_package_installer: # TODO: See if PR will be accepted (dev may not be active), else remove this comment
     git:
       url: https://github.com/ImranR98/android_package_installer
       ref: main
-  android_package_manager: ^0.7.0
+  android_package_manager: # TODO: Make PR and switch to upstream
+    git:
+      url: https://github.com/ImranR98/android_package_manager
+      ref: master
   share_plus: ^10.0.0
   sqflite: ^2.2.0+3
   easy_localization: ^3.0.1
@@ -64,7 +65,10 @@ dependencies:
   flutter_archive: ^6.0.0
   hsluv: ^1.1.3
   connectivity_plus: ^6.0.1
-  shared_storage: ^0.8.0
+  shared_storage: # TODO: Is this maintained?
+    git:
+      url: https://github.com/AlexBacich/shared-storage
+      ref: master
   crypto: ^3.0.3
   app_links: ^6.0.1
   background_fetch: ^1.2.1
@@ -110,20 +114,20 @@ flutter:
   uses-material-design: true
 
   # To add assets to your application, add an assets section, like this:
-  # - assets:
+  # assets:
   #   - images/a_dot_burr.jpeg
   #   - images/a_dot_ham.jpeg
-  
+
   assets:
     - assets/translations/
     - assets/graphics/
     - assets/ca/
 
   # An image asset can refer to one or more resolution-specific "variants", see
-  # https://flutter.dev/assets-and-images/#resolution-aware
+  # https://flutter.dev/to/resolution-aware-images
 
   # For details regarding adding assets from package dependencies, see
-  # https://flutter.dev/assets-and-images/#from-packages
+  # https://flutter.dev/to/asset-from-package
 
   # To add custom fonts to your application, add a fonts section here,
   # in this "flutter" section. Each entry in this list should have a
@@ -143,7 +147,7 @@ flutter:
   #         weight: 700
   #
   # For details regarding fonts from package dependencies,
-  # see https://flutter.dev/custom-fonts/#from-packages
+  # see https://flutter.dev/to/font-from-package
 
   fonts:
       - family: Wix-Madefor-Display