Update sigstore to pull in go-tuf security fixes (#617)

Signed-off-by: Hayden Blauzvern <hblauzvern@google.com>

go.mod

@@ -20,7 +20,7 @@ require (
 	github.com/prometheus/client_golang v1.12.2
 	github.com/prometheus/client_model v0.2.0
 	github.com/prometheus/common v0.34.0
-	github.com/sigstore/sigstore v1.2.1-0.20220511065721-90cde8531f64
+	github.com/sigstore/sigstore v1.2.1-0.20220526001230-8dc4fa90a468
 	github.com/spf13/cobra v1.4.0
 	github.com/spf13/pflag v1.0.5
 	github.com/spf13/viper v1.11.0
@@ -42,7 +42,7 @@ require (
 	cloud.google.com/go/iam v0.3.0 // indirect
 	cloud.google.com/go/kms v1.4.0 // indirect
 	filippo.io/edwards25519 v1.0.0-rc.1 // indirect
-	github.com/Azure/azure-sdk-for-go v64.0.0+incompatible // indirect
+	github.com/Azure/azure-sdk-for-go v65.0.0+incompatible // indirect
 	github.com/Azure/go-autorest v14.2.0+incompatible // indirect
 	github.com/Azure/go-autorest/autorest v0.11.27 // indirect
 	github.com/Azure/go-autorest/autorest/adal v0.9.18 // indirect
@@ -57,7 +57,7 @@ require (
 	github.com/ReneKroon/ttlcache/v2 v2.11.0 // indirect
 	github.com/armon/go-metrics v0.3.10 // indirect
 	github.com/armon/go-radix v1.0.0 // indirect
-	github.com/aws/aws-sdk-go v1.44.11 // indirect
+	github.com/aws/aws-sdk-go v1.44.22 // indirect
 	github.com/benbjohnson/clock v1.1.0 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/bgentry/speakeasy v0.1.0 // indirect
@@ -83,7 +83,7 @@ require (
 	github.com/golang/mock v1.6.0 // indirect
 	github.com/golang/snappy v0.0.4 // indirect
 	github.com/google/btree v1.0.1 // indirect
-	github.com/google/go-containerregistry v0.8.0 // indirect
+	github.com/google/go-containerregistry v0.9.0 // indirect
 	github.com/google/trillian v1.4.1 // indirect
 	github.com/googleapis/gax-go/v2 v2.4.0 // indirect
 	github.com/gorilla/websocket v1.4.2 // indirect
@@ -97,14 +97,14 @@ require (
 	github.com/hashicorp/go-retryablehttp v0.7.0 // indirect
 	github.com/hashicorp/go-rootcerts v1.0.2 // indirect
 	github.com/hashicorp/go-secure-stdlib/mlock v0.1.2 // indirect
-	github.com/hashicorp/go-secure-stdlib/parseutil v0.1.2 // indirect
+	github.com/hashicorp/go-secure-stdlib/parseutil v0.1.5 // indirect
 	github.com/hashicorp/go-secure-stdlib/strutil v0.1.2 // indirect
 	github.com/hashicorp/go-sockaddr v1.0.2 // indirect
 	github.com/hashicorp/go-uuid v1.0.2 // indirect
 	github.com/hashicorp/go-version v1.4.0 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
-	github.com/hashicorp/vault/api v1.5.0 // indirect
-	github.com/hashicorp/vault/sdk v0.4.1 // indirect
+	github.com/hashicorp/vault/api v1.6.0 // indirect
+	github.com/hashicorp/vault/sdk v0.5.0 // indirect
 	github.com/hashicorp/yamux v0.0.0-20211028200310-0bc27b27de87 // indirect
 	github.com/inconshreveable/mousetrap v1.0.0 // indirect
 	github.com/jhump/protoreflect v1.10.3 // indirect
@@ -120,7 +120,7 @@ require (
 	github.com/mitchellh/copystructure v1.2.0 // indirect
 	github.com/mitchellh/go-homedir v1.1.0 // indirect
 	github.com/mitchellh/go-testing-interface v1.14.1 // indirect
-	github.com/mitchellh/mapstructure v1.4.3 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
 	github.com/mitchellh/reflectwalk v1.0.2 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
@@ -143,7 +143,7 @@ require (
 	github.com/spf13/jwalterweatherman v1.1.0 // indirect
 	github.com/subosito/gotenv v1.2.0 // indirect
 	github.com/thales-e-security/pool v0.0.2 // indirect
-	github.com/theupdateframework/go-tuf v0.0.0-20220127213825-87caa18db2a6 // indirect
+	github.com/theupdateframework/go-tuf v0.3.0 // indirect
 	github.com/titanous/rocacheck v0.0.0-20171023193734-afe73141d399 // indirect
 	github.com/tmc/grpc-websocket-proxy v0.0.0-20201229170055-e5319fda7802 // indirect
 	github.com/transparency-dev/merkle v0.0.1 // indirect