Use the correct verifier for RSA PSS scheme keys #1085

Job	Run time
examples / client (ubuntu-latest)	11s
examples / repository (ubuntu-latest)	11s
examples / client (macos-latest)	10s
examples / repository (macos-latest)	11s
examples / client (windows-latest)	1m 40s
examples / repository (windows-latest)	2m 0s
examples / multirepo (ubuntu-latest)	11s
examples / root-signing (ubuntu-latest)	17s
examples / multirepo (macos-latest)	12s
examples / root-signing (macos-latest)	16s
examples / multirepo (windows-latest)	1m 53s
examples / root-signing (windows-latest)	1m 33s
linting / golangci-lint	14s
examples / tuf-client-cli (ubuntu-latest)	19s
examples / tuf-client-cli (macos-latest)	15s
linting / govulncheck	16s
tests / Run (ubuntu-latest)	34s
examples / tuf-client-cli (windows-latest)	1m 29s
tests / Run (macos-latest)	30s
tests / Run (windows-latest)	2m 2s
	14m 24s

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