Increase tag-releases timeout

When a large number of repos are included in a release request, it's
been seen where the tagging process takes long enough per repo that we
sometimes run into timeouts. To help avoid this condition, though rare,
this increases the timeout setting for the tag-releases job.

Change-Id: I8d22ead8724406203a8f5eda502319be5789ef89
Signed-off-by: Sean McGinnis <sean.mcginnis@gmail.com>

zuul.d/jobs.yaml

@@ -1075,6 +1075,7 @@
     run: playbooks/release/tag.yaml
     post-run: playbooks/release/post.yaml
     final: true
+    timeout: 3600
     secrets:
       - name: lp_creds
         secret: lp_creds