[CI] Update lock workflow file

Author: hc-github-team-tf-provider-devex

.github/workflows/lock.yml

@@ -14,6 +14,7 @@ jobs:
       # https://github.com/hashicorp/terraform-devex-repos/blob/main/modules/repo/workflows/lock.tftpl
       - uses: dessant/lock-threads@1bf7ec25051fe7c00bdd17e6a7cf3d7bfb7dc771 # v5.0.1
         with:
+          process-only: 'issues, prs'
           github-token: ${{ github.token }}
           issue-inactive-days: '30'
           issue-lock-reason: resolved