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fix: permit string compression levels in `zstd` codec metadata (for `… #959

Job	Run time
clippy	1m 9s
build_and_test_windows	6m 10s
build_and_test_macos (macos-13)	3m 27s
build_and_test (stable, --features "")	2m 12s
build_and_test_macos (macos-latest)	1m 44s
codecov	3m 57s
build_and_test (stable, --all-features)	2m 39s
fmt	35s
build_and_test (stable, --no-default-features)	2m 7s
build_and_test (1.82, --features "")	2m 22s
minimal-versions	2m 50s
semver	3m 55s
build_and_test (1.82, --all-features)	3m 3s
build_and_test (1.82, --no-default-features)	2m 1s
build_and_test (beta, --features "")	1m 59s
build_and_test (beta, --all-features)	2m 12s
build_and_test (beta, --no-default-features)	1m 31s
build_and_test (nightly, --features "")	2m 31s
build_and_test (nightly, --all-features)	2m 48s
build_and_test (nightly, --no-default-features)	2m 15s
	51m 27s

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