Keep unknown server and client capability keys #4459

Job	Run time
checks / docs	1m 17s
checks / pre-commit	1m 10s
checks / test (3.12, lowest-direct, windows-latest)	2m 17s
checks / test (3.11, locked, windows-latest)	1m 27s
checks / test (3.10, locked, windows-latest)	2m 24s
checks / test (3.13, locked, ubuntu-latest)	1m 17s
checks / test (3.14, locked, ubuntu-latest)	1m 13s
checks / readme-snippets	12s
checks / test (3.13, lowest-direct, windows-latest)	1m 22s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 1s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 42s
checks / test (3.12, locked, windows-latest)	2m 22s
checks / test (3.12, locked, ubuntu-latest)	1m 25s
checks / test (3.14, lowest-direct, windows-latest)	1m 44s
checks / test (3.14, locked, windows-latest)	2m 16s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 27s
checks / test (3.13, locked, windows-latest)	2m 28s
checks / test (3.11, lowest-direct, windows-latest)	2m 11s
checks / test (3.11, locked, ubuntu-latest)	1m 9s
checks / test (3.10, locked, ubuntu-latest)	1m 35s
checks / test (3.10, lowest-direct, windows-latest)	2m 20s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 6s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 25s
all-green	5s
	36m 55s

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