chore: Bump github.com/sigstore/sigstore from 1.8.4 to 1.8.6

Bumps [github.com/sigstore/sigstore](https://github.com/sigstore/sigstore) from 1.8.4 to 1.8.6.
- [Release notes](https://github.com/sigstore/sigstore/releases)
- [Commits](sigstore/sigstore@v1.8.4...v1.8.6)

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

Signed-off-by: dependabot[bot] <[email protected]>

go.mod

@@ -1,6 +1,7 @@
 module github.com/ratify-project/ratify
 
 go 1.21
+toolchain go1.22.4
 
 // Accidentally published prior to 1.0.0 release
 retract (
@@ -38,17 +39,17 @@ require (
 	github.com/owenrumney/go-sarif/v2 v2.3.1
 	github.com/pkg/errors v0.9.1
 	github.com/sigstore/cosign/v2 v2.2.4
-	github.com/sigstore/sigstore v1.8.4
+	github.com/sigstore/sigstore v1.8.6
 	github.com/sirupsen/logrus v1.9.3
 	github.com/spdx/tools-golang v0.5.4
 	github.com/spf13/cobra v1.8.1
 	github.com/xlab/treeprint v1.1.0
 	go.opentelemetry.io/otel/exporters/prometheus v0.39.0
-	go.opentelemetry.io/otel/metric v1.24.0
+	go.opentelemetry.io/otel/metric v1.27.0
 	go.opentelemetry.io/otel/sdk/metric v0.39.0
 	golang.org/x/sync v0.7.0
-	google.golang.org/grpc v1.62.2
-	google.golang.org/protobuf v1.33.0
+	google.golang.org/grpc v1.64.0
+	google.golang.org/protobuf v1.34.1
 	k8s.io/api v0.28.11
 	k8s.io/apimachinery v0.28.11
 	k8s.io/client-go v0.28.11
@@ -122,8 +123,7 @@ require (
 	github.com/xanzy/go-gitlab v0.102.0 // indirect
 	github.com/yashtewari/glob-intersection v0.2.0 // indirect
 	go.step.sm/crypto v0.44.2 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20240318140521-94a12d6c2237 // indirect
-	gopkg.in/go-jose/go-jose.v2 v2.6.3 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20240520151616-dc85e6b867a5 // indirect
 	gotest.tools/v3 v3.1.0 // indirect
 	sigs.k8s.io/release-utils v0.7.7 // indirect
 )
@@ -188,7 +188,7 @@ require (
 	github.com/json-iterator/go v1.1.12 // indirect
 	github.com/klauspost/compress v1.17.4 // indirect
 	github.com/kylelemons/godebug v1.1.0 // indirect
-	github.com/letsencrypt/boulder v0.0.0-20231026200631-000cd05d5491 // indirect
+	github.com/letsencrypt/boulder v0.0.0-20240620165639-de9c06129bec // indirect
 	github.com/magiconair/properties v1.8.7 // indirect
 	github.com/mailru/easyjson v0.7.7 // indirect
 	github.com/mitchellh/go-homedir v1.1.0 // indirect
@@ -227,17 +227,17 @@ require (
 	github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 // indirect
 	github.com/xeipuuv/gojsonschema v1.2.0
 	go.mongodb.org/mongo-driver v1.14.0 // indirect
-	go.opentelemetry.io/otel v1.24.0
-	go.opentelemetry.io/otel/sdk v1.24.0
-	go.opentelemetry.io/otel/trace v1.24.0 // indirect
+	go.opentelemetry.io/otel v1.27.0
+	go.opentelemetry.io/otel/sdk v1.27.0
+	go.opentelemetry.io/otel/trace v1.27.0 // indirect
 	go.uber.org/atomic v1.11.0 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
 	go.uber.org/zap v1.27.0 // indirect
 	golang.org/x/crypto v0.24.0
-	golang.org/x/exp v0.0.0-20231108232855-2478ac86f678 // indirect
+	golang.org/x/exp v0.0.0-20240112132812-db7319d0e0e3 // indirect
 	golang.org/x/mod v0.17.0 // indirect
 	golang.org/x/net v0.26.0 // indirect
-	golang.org/x/oauth2 v0.20.0 // indirect
+	golang.org/x/oauth2 v0.21.0 // indirect
 	golang.org/x/sys v0.21.0 // indirect
 	golang.org/x/term v0.21.0 // indirect
 	golang.org/x/text v0.16.0 // indirect