add timeout for _getRepoHash

https://github.com/acmesh-official/acme.sh/issues/5200

acme.sh

@@ -7082,7 +7082,7 @@ _getRepoHash() {
   _hash_path=$1
   shift
   _hash_url="${PROJECT_API:-https://api.github.com/repos/acmesh-official}/$PROJECT_NAME/git/refs/$_hash_path"
-  _get $_hash_url | tr -d "\r\n" | tr '{},' '\n\n\n' | grep '"sha":' | cut -d '"' -f 4
+  _get "$_hash_url" "" 30 | tr -d "\r\n" | tr '{},' '\n\n\n' | grep '"sha":' | cut -d '"' -f 4
 }
 
 _getUpgradeHash() {