wheel: Remove tmp workaround with pygame version.

As discussed in #2423
pygame version 2.5.1 should have fixed the issue with older
macOS releases. So, we can remove this max version clamp.

mu/wheels/__init__.py

@@ -37,11 +37,7 @@ class WheelsBuildError(WheelsError):
 # Any additional elements are passed to `pip` for specific purposes
 #
 mode_packages = [
-    # pygame is a pgzero dependency, but there is currently an issue where
-    # pygame versions >=2.1.3 have issues in macOS 10.x, so temporarily for
-    # Mu release 1.2.1 pin the max version here
-    # https://github.com/mu-editor/mu/issues/2423
-    ("pgzero", ("pgzero>=1.2.1", "pygame<2.1.3")),
+    ("pgzero", ("pgzero>=1.2.1",)),
     # Lock Werkzeug to < 3.0.0: import flask fails, otherwise.
     ("flask", ("flask==2.0.3", "Werkzeug<3.0.0")),
     # The version of ipykernel here should match to the version used by