Return METHOD_NOT_FOUND for invalid request methods #1708

Job	Run time
checks / pre-commit	19s
checks / readme-snippets	11s
checks / test (3.11, lowest-direct, ubuntu-latest)	51s
checks / test (3.12, lowest-direct, windows-latest)	3m 23s
checks / test (3.10, lowest-direct, windows-latest)	2m 16s
checks / test (3.11, locked, ubuntu-latest)	54s
checks / test (3.10, lowest-direct, ubuntu-latest)	58s
checks / test (3.12, locked, windows-latest)	3m 2s
checks / test (3.10, locked, ubuntu-latest)	51s
checks / test (3.12, locked, ubuntu-latest)	55s
checks / test (3.11, locked, windows-latest)	2m 18s
checks / test (3.10, locked, windows-latest)	2m 30s
checks / test (3.11, lowest-direct, windows-latest)	3m 13s
checks / test (3.12, lowest-direct, ubuntu-latest)	57s
checks / test (3.14, locked, ubuntu-latest)	2m 9s
checks / test (3.14, lowest-direct, windows-latest)	2m 18s
checks / test (3.13, locked, windows-latest)	2m 18s
checks / test (3.13, lowest-direct, ubuntu-latest)	49s
checks / test (3.14, locked, windows-latest)	2m 57s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 12s
checks / test (3.13, locked, ubuntu-latest)	46s
checks / test (3.13, lowest-direct, windows-latest)	2m 57s
all-green	3s
	38m 7s

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