ci: update giteabot to v1.3.1 (#39947)

Bump `giteabot` to
[`v1.3.1`](https://github.com/go-gitea/giteabot/releases/tag/v1.3.1) in
both workflows. It fixes `reviewed/wait-merge` PRs that the merge queue
left behind their base, like
https://github.com/go-gitea/gitea/pull/39854 and
https://github.com/go-gitea/gitea/pull/39928, and stops the lgtm sweep
from re-posting unchanged statuses
(https://github.com/go-gitea/giteabot/pull/30).

.github/workflows/giteabot-backport.yml

@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 30
     steps:
-      - uses: go-gitea/giteabot@e2cb0463239cb620aee6cbb2578e922607a64832 # v1.3.0
+      - uses: go-gitea/giteabot@36ea99f821fefa3e8fb26aeac6211735664cd9c0 # v1.3.1
         with:
           github_token: ${{ secrets.GITEABOT_TOKEN }}
           gitea_fork: giteabot/gitea

.github/workflows/giteabot.yml

@@ -56,7 +56,7 @@ jobs:
       pull-requests: write
       statuses: write
     steps:
-      - uses: go-gitea/giteabot@e2cb0463239cb620aee6cbb2578e922607a64832 # v1.3.0
+      - uses: go-gitea/giteabot@36ea99f821fefa3e8fb26aeac6211735664cd9c0 # v1.3.1
         with:
           github_token: ${{ secrets.GITEABOT_TOKEN }}
           checks: ${{ github.event.inputs.checks || 'backport_branches,labels,merge_queue,lock,feedback,last_call,milestones,lgtm,translation_comment,pr_actions' }}