Bump github.com/sigstore/sigstore from 1.6.5 to 1.7.3 (guacsec#1221)

Bumps [github.com/sigstore/sigstore](https://github.com/sigstore/sigstore) from 1.6.5 to 1.7.3.
- [Release notes](https://github.com/sigstore/sigstore/releases)
- [Commits](sigstore/sigstore@v1.6.5...v1.7.3)

---
updated-dependencies:
- dependency-name: github.com/sigstore/sigstore
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

go.mod

@@ -205,7 +205,7 @@ require (
 	github.com/prometheus/client_golang v1.15.1
 	github.com/regclient/regclient v0.5.1
 	github.com/segmentio/ksuid v1.0.4
-	github.com/sigstore/sigstore v1.6.5
+	github.com/sigstore/sigstore v1.7.3
 	github.com/spdx/tools-golang v0.5.3
 	github.com/spf13/viper v1.16.0
 	github.com/stretchr/testify v1.8.4

go.sum

@@ -547,8 +547,8 @@ github.com/shurcooL/githubv4 v0.0.0-20201206200315-234843c633fa h1:jozR3igKlnYCj
 github.com/shurcooL/githubv4 v0.0.0-20201206200315-234843c633fa/go.mod h1:hAF0iLZy4td2EX+/8Tw+4nodhlMrwN3HupfaXj3zkGo=
 github.com/shurcooL/graphql v0.0.0-20200928012149-18c5c3165e3a h1:KikTa6HtAK8cS1qjvUvvq4QO21QnwC+EfvB+OAuZ/ZU=
 github.com/shurcooL/graphql v0.0.0-20200928012149-18c5c3165e3a/go.mod h1:AuYgA5Kyo4c7HfUmvRGs/6rGlMMV/6B1bVnB9JxJEEg=
-github.com/sigstore/sigstore v1.6.5 h1:/liHIo7YPJp6sN31DzBYDOuRPmN1xbzROMBE5DLllYM=
-github.com/sigstore/sigstore v1.6.5/go.mod h1:h+EoQsf9+6UKgNYxKhBcPgo4PZeEVfzAJxKRRIYhyN4=
+github.com/sigstore/sigstore v1.7.3 h1:HVVTfrMezJeLyl2xhJ8edzkrEGBa4KxjQZB4FlQ4JLU=
+github.com/sigstore/sigstore v1.7.3/go.mod h1:cl0c7Dtg3MM3c13L8pqqrfrmBa0eM3POcdtBepjylmw=
 github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6MwdIuYE2rE=
 github.com/sirupsen/logrus v1.7.0/go.mod h1:yWOB1SBYBC5VeMP7gHvWumXLIWorT60ONWic61uBYv0=
 github.com/sirupsen/logrus v1.8.1/go.mod h1:yWOB1SBYBC5VeMP7gHvWumXLIWorT60ONWic61uBYv0=