Added support to use standard OS secret store to save server/ssh tunnel passwords instead of master password in pgAdmin desktop mode. #5123

web/pgAdmin4.py

@@ -12,6 +12,8 @@ a webserver, this will provide the WSGI interface, otherwise, we're going
 to start a web server."""
 
 import sys
+if sys.version_info <= (3, 9):
+    import select
 
 if sys.version_info < (3, 4):
     raise RuntimeError('This application must be run under Python 3.4 '