Bump github.com/sigstore/sigstore from 1.6.3 to 1.6.4

Bumps [github.com/sigstore/sigstore](https://github.com/sigstore/sigstore) from 1.6.3 to 1.6.4.
- [Release notes](https://github.com/sigstore/sigstore/releases)
- [Commits](sigstore/sigstore@v1.6.3...v1.6.4)

---
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>

go.mod

@@ -20,7 +20,7 @@ require (
 	github.com/sigstore/cosign/v2 v2.0.2
 	github.com/sigstore/fulcio v1.3.1
 	github.com/sigstore/rekor v1.1.1
-	github.com/sigstore/sigstore v1.6.3
+	github.com/sigstore/sigstore v1.6.4
 	github.com/sigstore/timestamp-authority v1.0.0
 	github.com/theupdateframework/go-tuf v0.5.2
 	github.com/titanous/rocacheck v0.0.0-20171023193734-afe73141d399
@@ -51,8 +51,8 @@ require (
 	filippo.io/edwards25519 v1.0.0 // indirect
 	github.com/Azure/azure-sdk-for-go v68.0.0+incompatible // indirect
 	github.com/Azure/go-autorest v14.2.0+incompatible // indirect
-	github.com/Azure/go-autorest/autorest v0.11.28 // indirect
-	github.com/Azure/go-autorest/autorest/adal v0.9.21 // indirect
+	github.com/Azure/go-autorest/autorest v0.11.29 // indirect
+	github.com/Azure/go-autorest/autorest/adal v0.9.22 // indirect
 	github.com/Azure/go-autorest/autorest/azure/auth v0.5.12 // indirect
 	github.com/Azure/go-autorest/autorest/azure/cli v0.4.6 // indirect
 	github.com/Azure/go-autorest/autorest/date v0.3.0 // indirect
@@ -62,19 +62,19 @@ require (
 	github.com/Azure/go-autorest/tracing v0.6.0 // indirect
 	github.com/Microsoft/go-winio v0.6.0 // indirect
 	github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2 // indirect
-	github.com/aws/aws-sdk-go v1.44.248 // indirect
-	github.com/aws/aws-sdk-go-v2 v1.17.8 // indirect
-	github.com/aws/aws-sdk-go-v2/config v1.18.21 // indirect
-	github.com/aws/aws-sdk-go-v2/credentials v1.13.20 // indirect
-	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.13.2 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/configsources v1.1.32 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.4.26 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/ini v1.3.33 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.9.26 // indirect
-	github.com/aws/aws-sdk-go-v2/service/kms v1.20.11 // indirect
-	github.com/aws/aws-sdk-go-v2/service/sso v1.12.8 // indirect
-	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.14.8 // indirect
-	github.com/aws/aws-sdk-go-v2/service/sts v1.18.9 // indirect
+	github.com/aws/aws-sdk-go v1.44.257 // indirect
+	github.com/aws/aws-sdk-go-v2 v1.18.0 // indirect
+	github.com/aws/aws-sdk-go-v2/config v1.18.23 // indirect
+	github.com/aws/aws-sdk-go-v2/credentials v1.13.22 // indirect
+	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.13.3 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/configsources v1.1.33 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.4.27 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/ini v1.3.34 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.9.27 // indirect
+	github.com/aws/aws-sdk-go-v2/service/kms v1.21.1 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sso v1.12.10 // indirect
+	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.14.10 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sts v1.18.11 // indirect
 	github.com/aws/smithy-go v1.13.5 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/blang/semver v3.5.1+incompatible // indirect
@@ -124,7 +124,7 @@ require (
 	github.com/google/go-containerregistry v0.14.1-0.20230409045903-ed5c185df419 // indirect
 	github.com/google/go-querystring v1.1.0 // indirect
 	github.com/google/gofuzz v1.2.0 // indirect
-	github.com/google/s2a-go v0.1.2 // indirect
+	github.com/google/s2a-go v0.1.3 // indirect
 	github.com/google/tink/go v1.7.0 // indirect
 	github.com/googleapis/enterprise-certificate-proxy v0.2.3 // indirect
 	github.com/googleapis/gax-go/v2 v2.8.0 // indirect
@@ -169,7 +169,7 @@ require (
 	github.com/rs/cors v1.9.0 // indirect
 	github.com/ryanuber/go-glob v1.0.0 // indirect
 	github.com/sassoftware/relic v7.2.1+incompatible // indirect
-	github.com/secure-systems-lab/go-securesystemslib v0.5.0 // indirect
+	github.com/secure-systems-lab/go-securesystemslib v0.6.0 // indirect
 	github.com/segmentio/ksuid v1.0.4 // indirect
 	github.com/shibumi/go-pathspec v1.3.0 // indirect
 	github.com/sirupsen/logrus v1.9.0 // indirect
@@ -202,12 +202,12 @@ require (
 	golang.org/x/net v0.9.0 // indirect
 	golang.org/x/oauth2 v0.7.0 // indirect
 	golang.org/x/sync v0.1.0 // indirect
-	golang.org/x/sys v0.7.0 // indirect
-	golang.org/x/term v0.7.0 // indirect
+	golang.org/x/sys v0.8.0 // indirect
+	golang.org/x/term v0.8.0 // indirect
 	golang.org/x/text v0.9.0 // indirect
 	golang.org/x/time v0.3.0 // indirect
 	golang.org/x/tools v0.7.0 // indirect
-	google.golang.org/api v0.120.0 // indirect
+	google.golang.org/api v0.121.0 // indirect
 	google.golang.org/appengine v1.6.7 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect