Reenable gzipping, pull in statigz fix, fix proxy prefix (#2039)

Co-authored-by: peolic <66393006+peolic@users.noreply.github.com>

vendor/github.com/vearutop/statigz/server.go

@@ -216,6 +216,11 @@ func (s *Server) serve(rw http.ResponseWriter, req *http.Request, fn, suf, enc s
 		ctype = "application/octet-stream" // Prevent unreliable Content-Type detection on compressed data.
 	}
 
+	// This is used to enforce application/javascript MIME on Windows (https://github.com/golang/go/issues/32350)
+	if strings.HasSuffix(req.URL.Path, ".js") {
+		ctype = "application/javascript"
+	}
+
 	rw.Header().Set("Content-Type", ctype)
 	rw.Header().Set("Etag", info.hash)