migrate: Disable too-many-locals and branches lints

These scripts are throw-away, so we don't care about a bit of extra
complexity here.

Signed-off-by: Leandro Lucarella <luca-frequenz@llucax.com>

Author: llucax

.github/cookiecutter-migrate.template.py

@@ -20,7 +20,7 @@
 And remember to follow any manual instructions for each run.
 """  # noqa: E501
 
-# pylint: disable=too-many-lines
+# pylint: disable=too-many-lines, too-many-locals, too-many-branches
 
 import hashlib
 import json

cookiecutter/migrate.py

@@ -20,7 +20,7 @@
 And remember to follow any manual instructions for each run.
 """  # noqa: E501
 
-# pylint: disable=too-many-lines
+# pylint: disable=too-many-lines, too-many-locals, too-many-branches
 
 import hashlib
 import json