Bump github.com/sigstore/sigstore from 1.7.5 to 1.7.6 (#1587)

Bumps [github.com/sigstore/sigstore](https://github.com/sigstore/sigstore) from 1.7.5 to 1.7.6.
- [Release notes](https://github.com/sigstore/sigstore/releases)
- [Commits](sigstore/sigstore@v1.7.5...v1.7.6)

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

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

go.mod

@@ -280,7 +280,7 @@ require (
 	github.com/regclient/regclient v0.5.5
 	github.com/segmentio/kafka-go v0.4.46
 	github.com/segmentio/ksuid v1.0.4
-	github.com/sigstore/sigstore v1.7.5
+	github.com/sigstore/sigstore v1.7.6
 	github.com/spdx/tools-golang v0.5.3
 	github.com/spf13/viper v1.18.2
 	github.com/stretchr/testify v1.8.4

go.sum

@@ -627,8 +627,8 @@ 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 v1.7.5 h1:ij55dBhLwjICmLTBJZm7SqoQLdsu/oowDanACcJNs48=
-github.com/sigstore/sigstore v1.7.5/go.mod h1:9OCmYWhzuq/G4e1cy9m297tuMRJ1LExyrXY3ZC3Zt/s=
+github.com/sigstore/sigstore v1.7.6 h1:zB0woXx+3Bp7dk7AjklHF1VhXBdCs84VXkZbp0IHLv8=
+github.com/sigstore/sigstore v1.7.6/go.mod h1:FJE+NpEZIs4QKqZl4B2RtaVLVDcDtocAwTiNlexeBkY=
 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=