Bump dessant/lock-threads from 3.0.0 to 4.0.0 (#385)

Author: dependabot[bot]

.github/workflows/lock.yml

@@ -12,7 +12,7 @@ jobs:
     name: 🔒 Lock!
     runs-on: ubuntu-latest
     steps:
-      - uses: dessant/lock-threads@v3.0.0
+      - uses: dessant/lock-threads@v4.0.0
         with:
           github-token: ${{ github.token }}
           issue-inactive-days: "30"