pylintrc: disable unsubscriptable-object error

This check is flaky and sometimes reports false-positive errors.

  pylint-dev/pylint#1498

Disable the check since we cannot rely on it to find report actual bugs.

Signed-off-by: Robin Jarry <robin@jarry.cc>

common/pylintrc

@@ -142,6 +142,7 @@ disable=
   interface-not-implemented,
   bad-continuation,
   keyword-arg-before-vararg,
+  unsubscriptable-object,
   inconsistent-return-statements  # (implicit return None)
 
 [REPORTS]