chore(deps): bump github.com/sigstore/sigstore from 1.8.3 to 1.8.4 #1024

Job	Run time
examples / client (ubuntu-latest)	19s
examples / repository (ubuntu-latest)	20s
examples / client (macos-latest)	18s
examples / repository (macos-latest)	34s
examples / client (windows-latest)	1m 49s
examples / repository (windows-latest)	1m 46s
examples / multirepo (ubuntu-latest)	19s
examples / root-signing (ubuntu-latest)	20s
examples / root-signing (macos-latest)	25s
examples / multirepo (macos-latest)	19s
examples / root-signing (windows-latest)	1m 22s
examples / tuf-client-cli (ubuntu-latest)	20s
examples / multirepo (windows-latest)	1m 33s
examples / tuf-client-cli (macos-latest)	29s
linting / govulncheck	23s
examples / tuf-client-cli (windows-latest)	56s
linting / golangci-lint	2m 36s
tests / Run (ubuntu-latest)	28s
tests / Run (macos-latest)	31s
tests / Run (windows-latest)	3m 5s
	18m 12s

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