Fix mypy lintrunner (#7534)

Author: mergennachin

.lintrunner.toml

@@ -321,6 +321,7 @@ command = [
     '--config=.mypy.ini',
     '--show-disable',
     '--',
+    '--explicit-package-bases',
     '@{{PATHSFILE}}'
 ]
 init_command = [

docs/source/conf.py

@@ -197,7 +197,7 @@
 
 # Custom directives defintions to create cards on main landing page
 
-from custom_directives import (
+from custom_directives import (  # type: ignore[import-not-found]
     CustomCardEnd,
     CustomCardItem,
     CustomCardStart,