chore: use released serious_python 4.1.1; drop temp git override

serious_python 4.1.1 (with the x86_64 _sysconfigdata fix, PR #218) is on
pub.dev. Bump the build template serious_python 4.1.0 -> 4.1.1 and remove the
temporary git override from flet_test_counter (the fix branch was deleted after
release, which broke 'flutter pub get' on fresh runners — the linux-arm64 legs
failed with 'could not find git ref fix/android-x86_64-sysconfigdata').

Author: FeodorFitsner

sdk/python/examples/apps/flet_test_counter/pyproject.toml

@@ -44,8 +44,3 @@ flet = "../../../packages/flet"
 # Dart flet = in-repo source (relative to the provisioned build/flutter dir).
 [tool.flet.flutter.pubspec.dependency_overrides]
 flet = { path = "../../../../../../../packages/flet" }
-# TEMPORARY: pull serious_python from the x86_64 _sysconfigdata fix branch
-# (flet-dev/serious-python#218) so the android x86_64 CI leg validates it.
-# Revert to the pub.dev release once that PR ships.
-serious_python_android = { git = { url = "https://github.com/flet-dev/serious-python.git", ref = "fix/android-x86_64-sysconfigdata", path = "src/serious_python_android" } }
-serious_python_platform_interface = { git = { url = "https://github.com/flet-dev/serious-python.git", ref = "fix/android-x86_64-sysconfigdata", path = "src/serious_python_platform_interface" } }

sdk/python/templates/build/{{cookiecutter.out_dir}}/pubspec.yaml

@@ -18,7 +18,7 @@ dependencies:
   flet:
     path: ../../../../../packages/flet
 
-  serious_python: 4.1.0
+  serious_python: 4.1.1
 
   # MsgPack codec used by the dart_bridge FletBackendChannel implementation
   # in lib/main.dart — matches the wire format flet's existing socket