chore: update licensing to Apache 2.0 for new contributions #4029

Job	Run time
checks / pre-commit	32s
checks / readme-snippets	10s
checks / test (3.10, lowest-direct, windows-latest)	2m 15s
checks / test (3.11, lowest-direct, windows-latest)	2m 29s
checks / test (3.11, lowest-direct, ubuntu-latest)	47s
checks / test (3.10, highest, ubuntu-latest)	49s
checks / test (3.10, lowest-direct, ubuntu-latest)	45s
checks / test (3.13, highest, ubuntu-latest)	47s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 10s
checks / test (3.13, highest, windows-latest)	2m 34s
checks / test (3.10, highest, windows-latest)	2m 20s
checks / test (3.14, highest, windows-latest)	2m 31s
checks / test (3.12, highest, ubuntu-latest)	54s
checks / test (3.14, highest, ubuntu-latest)	1m 13s
checks / test (3.12, highest, windows-latest)	3m 26s
checks / test (3.11, highest, windows-latest)	2m 56s
checks / test (3.13, lowest-direct, ubuntu-latest)	45s
checks / test (3.14, lowest-direct, windows-latest)	2m 30s
checks / test (3.12, lowest-direct, ubuntu-latest)	49s
checks / test (3.13, lowest-direct, windows-latest)	2m 32s
checks / test (3.12, lowest-direct, windows-latest)	3m 38s
checks / test (3.11, highest, ubuntu-latest)	48s
	36m 40s

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