github-actions: bump dessant/lock-threads from v2.0.1 to v2.0.3

Bumps [dessant/lock-threads](https://github.com/dessant/lock-threads) from v2.0.1 to v2.0.3.
- [Release notes](https://github.com/dessant/lock-threads/releases)
- [Changelog](https://github.com/dessant/lock-threads/blob/master/CHANGELOG.md)
- [Commits](dessant/lock-threads@v2.0.1...486f738)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/lock.yml

@@ -9,7 +9,7 @@ jobs:
   lock:
     runs-on: ubuntu-latest
     steps:
-      - uses: dessant/lock-threads@v2.0.1
+      - uses: dessant/lock-threads@v2.0.3
         with:
           github-token: ${{ github.token }}
           issue-lock-inactive-days: '180'