Icon should not have an extension. #3291

Job	Run time
Generate test matrix	6s
Test (ubuntu-20.04, 3.11)	2m 22s
Test (ubuntu-20.04, 3.10)	2m 38s
Test (ubuntu-22.04, 3.11)	2m 36s
Test (ubuntu-22.04, 3.10)	2m 27s
Test (windows-latest, 3.11)	4m 47s
Test (windows-latest, 3.10)	5m 21s
Test (macos-13, 3.11)	4m 19s
Test (macos-13, 3.10)	3m 25s
Test (macos-latest, 3.11)	1m 50s
Test (macos-latest, 3.10)	1m 51s
Test (ubuntu-latest, 3.11)	3m 23s
Test (ubuntu-latest, 3.10)	2m 29s
Installer (ubuntu-20.04, 3.11)	8m 48s
Installer (ubuntu-22.04, 3.11)	8m 38s
Installer (windows-latest, 3.11)	15m 58s
Installer (macos-13, 3.11)	28m 46s
Installer (macos-latest, 3.11)	17m 13s
Test installer (windows-latest, 3.11)	2m 11s
Test installer (ubuntu-20.04, 3.11)	1m 28s
	2h 0m 36s

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