Add more file extensions to the license headers that we handle #104

Job	Run time
Test without Docker / Windows (5.9 - windows-2022)	6m 8s
Test with Docker / Windows (5.9 - windows-2022)	11m 0s
Test without Docker / Windows (6.0 - windows-2022)	2m 34s
Test with Docker / Linux (5.8 - jammy)	29s
Test with Docker / Windows (6.0 - windows-2022)	8m 23s
Test without Docker / Windows (nightly - windows-2022)	2m 44s
Test with Docker / Linux (5.9 - jammy)	32s
Test with Docker / Windows (nightly - windows-2019)	9m 32s
Test without Docker / Linux (${{ matrix.swift_version }} - ${{ matrix.os_version }})	0s
Test without Docker / Windows (nightly-6.1 - windows-2022)	2m 43s
Test with Docker / Linux (5.10 - jammy)	28s
Test with Docker / Windows (nightly-6.1 - windows-2019)	9m 22s
Test with Docker / Linux (6.0 - jammy)	32s
Test with Docker / Linux (nightly-main - jammy)	35s
Test with Docker / Linux (nightly-6.1 - jammy)	37s
Soundness / API breakage check	0s
Soundness / Documentation check	44s
Soundness / Broken symlinks check	4s
Soundness / Format check	0s
Soundness / License headers check	5s
Soundness / Python lint check	5s
Soundness / Shell check	46s
Soundness / YAML lint check	3s
Soundness / Unacceptable language check	2s
	57m 28s

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