Fix license classifier #1066

Job	Run time
linters (3.9, ubuntu-latest)	1m 54s
Testing on Python 3.9 (ubuntu-latest)	1m 50s
Testing on Python 3.9 (macos-13)	3m 2s
Testing on Python 3.9 (windows-2019)	2m 44s
Testing on Python 3.10 (ubuntu-latest)	1m 54s
Testing on Python 3.10 (macos-13)	2m 45s
Testing on Python 3.10 (windows-2019)	2m 13s
Testing on Python 3.11 (ubuntu-latest)	1m 49s
Testing on Python 3.11 (macos-13)	2m 59s
Testing on Python 3.11 (windows-2019)	2m 22s
Testing on Python 3.12 (ubuntu-latest)	2m 2s
Testing on Python 3.12 (macos-13)	3m 30s
Testing on Python 3.12 (windows-2019)	3m 18s
Testing on Python 3.13 (ubuntu-latest)	2m 14s
Testing on Python 3.13 (macos-13)	3m 15s
Testing on Python 3.13 (windows-2019)	4m 5s
	41m 56s

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