Fixes Winforms Progressbar #5500

Job	Run time
Pre-commit checks / Pre-commit Checks	36s
Check towncrier / Towncrier Checks	36s
Python package (core) / Create Python Package	46s
Python package (android) / Create Python Package	55s
Python package (cocoa) / Create Python Package	50s
Python package (demo) / Create Python Package	49s
Python package (dummy) / Create Python Package	43s
Python package (gtk) / Create Python Package	1m 0s
Python package (iOS) / Create Python Package	52s
Python package (textual) / Create Python Package	43s
Python package (toga) / Create Python Package	44s
Python package (web) / Create Python Package	42s
Python package (winforms) / Create Python Package	44s
Test core (macos-12, 3.8)	1m 41s
Test core (macos-12, 3.12)	2m 8s
Test core (macos-12, 3.13-dev)	2m 54s
Test core (macos-14, 3.12)	46s
Test core (macos-14, 3.13-dev)	1m 33s
Test core (ubuntu-latest, 3.8)	1m 0s
Test core (ubuntu-latest, 3.12)	1m 2s
Test core (ubuntu-latest, 3.13-dev)	1m 56s
Test core (windows-latest, 3.8)	1m 43s
Test core (windows-latest, 3.12)	1m 54s
Test core (ubuntu-latest, 3.9, false)	54s
Test core (ubuntu-latest, 3.10, false)	50s
Test core (ubuntu-latest, 3.11, false)	51s
Coverage	36s
Testbed (macOS-x86_64)	3m 29s
Testbed (macOS-arm64)	3m 11s
Testbed (windows)	4m 15s
Testbed (linux)	3m 1s
Testbed (android)	7m 33s
Testbed (iOS)	4m 18s
	55m 35s

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