Update module golang.org/x/oauth2 to v0.21.0

go.mod

@@ -17,7 +17,7 @@ require (
 	github.com/tealeg/xlsx v1.0.5
 	go.hollow.sh/serverservice v0.16.2
 	go.hollow.sh/toolbox v0.6.2
-	golang.org/x/oauth2 v0.17.0
+	golang.org/x/oauth2 v0.21.0
 	gopkg.in/square/go-jose.v2 v2.6.0
 )
 
@@ -68,7 +68,6 @@ require (
 	github.com/lib/pq v1.10.9 // indirect
 	github.com/magiconair/properties v1.8.7 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
-	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
 	github.com/matttproud/golang_protobuf_extensions/v2 v2.0.0 // indirect
 	github.com/mitchellh/mapstructure v1.5.0 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
@@ -87,7 +86,6 @@ require (
 	github.com/sourcegraph/conc v0.3.0 // indirect
 	github.com/spf13/afero v1.11.0 // indirect
 	github.com/spf13/cast v1.6.0 // indirect
-	github.com/spf13/jwalterweatherman v1.1.0 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
 	github.com/subosito/gotenv v1.6.0 // indirect
 	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
@@ -114,11 +112,9 @@ require (
 	golang.org/x/text v0.14.0 // indirect
 	golang.org/x/xerrors v0.0.0-20231012003039-104605ab7028 // indirect
 	google.golang.org/api v0.165.0 // indirect
-	google.golang.org/appengine v1.6.8 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20240213162025-012b6fc9bca9 // indirect
 	google.golang.org/grpc v1.61.1 // indirect
 	google.golang.org/protobuf v1.32.0 // indirect
-	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )