ci: ensure triage actions work for PRs from forks

.github/workflows/pr-title.yml

@@ -1,7 +1,7 @@
 name: pr-title
 
 on:
-  pull_request:
+  pull_request_target:
     types:
       - opened
       - edited

.github/workflows/triage.yml

@@ -1,7 +1,7 @@
 name: triage
 
 on:
-  pull_request:
+  pull_request_target:
     types:
       - opened
   issues:
@@ -31,7 +31,6 @@ jobs:
     steps:
       - name: Tag with 'created-by'
         uses: actions/github-script@v7
-        if: github.event.action == 'opened'
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           script: |
@@ -93,6 +92,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
         with:
+          ref: ${{ github.event.pull_request.base.ref }}
           token: ${{ secrets.GITHUB_TOKEN }}
       - uses: ./.github/actions/triage
         with: