Use pkg/fulcioroots from sigstore/sigstore (#67)

Signed-off-by: Jason Hall <jason@chainguard.dev>

go.mod

@@ -14,9 +14,9 @@ require (
 	github.com/sigstore/cosign v1.8.1-0.20220601172726-ae90c7495df6
 	github.com/sigstore/fulcio v0.1.2-0.20220114150912-86a2036f9bc7
 	github.com/sigstore/rekor v0.8.0
-	github.com/sigstore/sigstore v1.2.1-0.20220526001230-8dc4fa90a468
+	github.com/sigstore/sigstore v1.2.1-0.20220614141825-9c0e2e247545
 	golang.org/x/crypto v0.0.0-20220411220226-7b82a4e95df4
-	golang.org/x/oauth2 v0.0.0-20220411215720-9780585627b5
+	golang.org/x/oauth2 v0.0.0-20220524215830-622c5d57e401
 )
 
 require (
@@ -177,17 +177,17 @@ require (
 	go.uber.org/multierr v1.8.0 // indirect
 	go.uber.org/zap v1.21.0 // indirect
 	golang.org/x/mod v0.6.0-dev.0.20220106191415-9b9b3d81d5e3 // indirect
-	golang.org/x/net v0.0.0-20220520000938-2e3eb7b945c2 // indirect
-	golang.org/x/sync v0.0.0-20220513210516-0976fa681c29 // indirect
+	golang.org/x/net v0.0.0-20220607020251-c690dde0001d // indirect
+	golang.org/x/sync v0.0.0-20220601150217-0de741cfad7f // indirect
 	golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a // indirect
 	golang.org/x/term v0.0.0-20210927222741-03fcf44c2211 // indirect
 	golang.org/x/text v0.3.7 // indirect
 	golang.org/x/time v0.0.0-20220411224347-583f2d630306 // indirect
 	golang.org/x/tools v0.1.10 // indirect
 	golang.org/x/xerrors v0.0.0-20220517211312-f3a8303e98df // indirect
-	google.golang.org/api v0.81.0 // indirect
+	google.golang.org/api v0.83.0 // indirect
 	google.golang.org/appengine v1.6.7 // indirect
-	google.golang.org/genproto v0.0.0-20220519153652-3a47de7e79bd // indirect
+	google.golang.org/genproto v0.0.0-20220602131408-e326c6e8e9c8 // indirect
 	google.golang.org/grpc v1.47.0 // indirect
 	google.golang.org/protobuf v1.28.0 // indirect
 	gopkg.in/cheggaaa/pb.v1 v1.0.28 // indirect
@@ -196,7 +196,7 @@ require (
 	gopkg.in/square/go-jose.v2 v2.6.0 // indirect
 	gopkg.in/warnings.v0 v0.1.2 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
-	gopkg.in/yaml.v3 v3.0.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 	gotest.tools/v3 v3.1.0 // indirect
 	knative.dev/pkg v0.0.0-20220325200448-1f7514acd0c2 // indirect
 	sigs.k8s.io/yaml v1.3.0 // indirect