Fix: add region tags

[engelke]

Description

Fixes missing region tags

[snippet-bot]

Here is the summary of changes.

You are about to add 13 region tags.

• appengine/standard_python3/bundled-services/blobstore/django/main.py:37, tag gae_blobstore_handler_django
• appengine/standard_python3/bundled-services/blobstore/django/main.py:89, tag gae_blobstore_handler_django
• appengine/standard_python3/bundled-services/blobstore/flask/main.py:29, tag gae_blobstore_handler_flask
• appengine/standard_python3/bundled-services/blobstore/wsgi/main.py:45, tag gae_blobstore_handler_wsgi
• appengine/standard_python3/bundled-services/deferred/django/main.py:15, tag gae_deferred_handler_django
• appengine/standard_python3/bundled-services/deferred/flask/main.py:15, tag gae_deferred_handler_flask
• appengine/standard_python3/bundled-services/deferred/wsgi/main.py:15, tag gae_deferred_handler_wsgi
• appengine/standard_python3/bundled-services/mail/django/main.py:72, tag gae_mail_handler_receive_django
• appengine/standard_python3/bundled-services/mail/django/main.py:85, tag gae_mail_handler_bounce_django
• appengine/standard_python3/bundled-services/mail/flask/main.py:70, tag gae_mail_handler_bounce_flask
• appengine/standard_python3/bundled-services/mail/flask/main.py:83, tag gae_mail_handler_receive_flask
• appengine/standard_python3/bundled-services/mail/wsgi/main.py:24, tag gae_mail_handler_receive_wsgi
• appengine/standard_python3/bundled-services/mail/wsgi/main.py:42, tag gae_mail_handler_bounce_wsgi

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[dandhlee]

LGTM.