Update vendor

vendor/k8s.io/client-go/transport/token_source.go

@@ -59,11 +59,24 @@ func NewCachedFileTokenSource(path string) oauth2.TokenSource {
 	}
 }
 
+// NewCachedTokenSource returns a oauth2.TokenSource reads a token from a
+// designed TokenSource. The ts would provide the source of token.
+func NewCachedTokenSource(ts oauth2.TokenSource) oauth2.TokenSource {
+	return &cachingTokenSource{
+		now:  time.Now,
+		base: ts,
+	}
+}
+
 type tokenSourceTransport struct {
 	base http.RoundTripper
 	ort  http.RoundTripper
 }
 
+func (tst *tokenSourceTransport) WrappedRoundTripper() http.RoundTripper {
+	return tst.base
+}
+
 func (tst *tokenSourceTransport) RoundTrip(req *http.Request) (*http.Response, error) {
 	// This is to allow --token to override other bearer token providers.
 	if req.Header.Get("Authorization") != "" {