Use the correct verifier for RSA PSS scheme keys #1083

Job	Run time
examples / root-signing (ubuntu-latest)	14s
examples / repository (ubuntu-latest)	51s
examples / multirepo (ubuntu-latest)	19s
examples / root-signing (macos-latest)	18s
examples / repository (macos-latest)	20s
examples / client (ubuntu-latest)	17s
examples / multirepo (macos-latest)	15s
examples / root-signing (windows-latest)	2m 10s
examples / repository (windows-latest)	1m 35s
examples / client (macos-latest)	20s
examples / multirepo (windows-latest)	1m 58s
examples / client (windows-latest)	2m 4s
examples / tuf-client-cli (ubuntu-latest)	25s
linting / golangci-lint	2m 28s
linting / govulncheck	16s
examples / tuf-client-cli (macos-latest)	20s
tests / Run (ubuntu-latest)	33s
examples / tuf-client-cli (windows-latest)	1m 35s
tests / Run (macos-latest)	26s
tests / Run (windows-latest)	2m 43s
	19m 27s

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