requirements: pin sigstore-rekor-types subdep #265

Job	Run time
selftest (ubuntu-latest)	17s
selftest-glob	16s
selftest (macos-latest)	34s
selftest-staging	19s
selftest (windows-latest)	1m 53s
selftest-xfail-invalid-inputs (--this-should-not-work)	11s
selftest-glob-multiple	16s
selftest-xfail-invalid-inputs (/tmp/extremely-nonexistent-file)	13s
selftest-xfail-glob-input-expansion	18s
selftest-upload-artifacts	19s
selftest-custom-paths	16s
selftest-identity-token	16s
selftest-verify	17s
selftest-xfail-verify-missing-options (true)	13s
selftest-xfail-verify-missing-options (true, https://token.actions.githubusercontent.com)	12s
selftest-xfail-verify-missing-options (true, https://github.com/sigstore/gh-action-sigstore-pytho...	15s
selftest-xfail-verify-missing-options (false, https://token.actions.githubusercontent.com)	14s
selftest-xfail-verify-missing-options (false, https://github.com/sigstore/gh-action-sigstore-pyth...	17s
all-selftests-pass	2s
	6m 38s

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