chore: update giteabot to v1.0.3 (#37896)

Bump the pinned `giteabot` action to the
[`v1.0.3`](https://github.com/go-gitea/giteabot/releases/tag/v1.0.3)
release in both `giteabot.yml` and `giteabot-backport.yml`. v1.0.3 moves
label/state queries off the search API on top of the existing retry
logic.

---
This PR was written with the help of Claude Opus 4.8

Co-authored-by: Claude (Opus 4.8) <noreply@anthropic.com>

.github/workflows/giteabot-backport.yml

@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 30
     steps:
-      - uses: go-gitea/giteabot@d4f19d5b4a88059d8c3ca78d660631506fc0c286 # add retry logic to giteabot
+      - uses: go-gitea/giteabot@f8a6f4c14d46920b4b5448852be3de72d00066f0 # v1.0.3
         with:
           github_token: ${{ secrets.GITEABOT_TOKEN }}
           gitea_fork: giteabot/gitea

.github/workflows/giteabot.yml

@@ -45,7 +45,7 @@ jobs:
     steps:
       # pull_request_review runs without repository secrets on fork PRs, so fall
       # back to the workflow token for the non-backport checks handled here.
-      - uses: go-gitea/giteabot@d4f19d5b4a88059d8c3ca78d660631506fc0c286 # add retry logic to giteabot
+      - uses: go-gitea/giteabot@f8a6f4c14d46920b4b5448852be3de72d00066f0 # v1.0.3
         with:
           github_token: ${{ secrets.GITEABOT_TOKEN || github.token }}
           checks: ${{ github.event.inputs.checks || 'labels,merge_queue,lock,feedback,last_call,milestones,lgtm,translation_comment,pr_actions' }}