fix: Reenable staleness bot (#738)

* Reenable staleness bot

Reenable staleness bot on the repo

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* Update owlbot.py

* Update auto-label.yaml

* Update auto-label.yaml

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: losalex

.github/auto-label.yaml

@@ -13,3 +13,7 @@
 # limitations under the License.
 requestsize:
   enabled: true
+staleness:
+  pullrequest: true
+  old: 30
+  extraold: 60

owlbot.py

@@ -21,4 +21,5 @@
     '.github/CODEOWNERS',
     '.github/blunderbuss.yml',
     'CONTRIBUTING.md',
-])
+    '.github/auto-label.yaml',
+])