Use mongo 4.0 server

MongoDB\Driver\Exception\ConnectionException: Server at 127.0.0.1:27017 reports wire version 6, but this version of libmongoc requires at least 7 (MongoDB 4.0)

Author: glensc

.github/workflows/tests-mongodb.yml

@@ -21,7 +21,7 @@ jobs:
 
     services:
       mongodb:
-        image: percona/percona-server-mongodb:3.6
+        image: percona/percona-server-mongodb:4.0
         ports:
           - 27017:27017