Use new self-repository syntax for local GitHub actions (#706)

.github/workflows/release-pr.yml

@@ -122,12 +122,7 @@ jobs:
       pull-requests: write # to comment on the pull request with the release result (changesets/action)
 
     steps:
-      - name: Check out repo
-        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
-        with:
-          persist-credentials: false
-
-      - uses: ./.github/actions/ci-setup
+      - uses: $/.github/actions/ci-setup
         with:
           skip-cache: true # avoid cache poisoning attacks
 
@@ -166,7 +161,7 @@ jobs:
       - name: Build
         run: pnpm build
 
-      - uses: ./.github/actions/setup-bot-auth
+      - uses: $/.github/actions/setup-bot-auth
         id: bot-auth
         with:
           client-id: ${{ vars.APP_CLIENT_ID }}