ci(workflows): avoid extra API call in update-stable-titles

Avoid the extra API read since the event payload already has what we need. The workflow currently calls `pulls.get()` before doing anything. For pull_request `opened` and `edited` events, all of what we need should already be available in `context.payload.pull_request`,

Signed-off-by: Josh <josh.t.richards@gmail.com>

Author: joshtrichards

.github/workflows/update-stable-titles.yml

@@ -39,12 +39,7 @@ jobs:
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           script: |
-            const { data: pr } = await github.rest.pulls.get({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              pull_number: context.issue.number,
-            });
-
+            const pr = context.payload.pull_request;
             const baseBranch = pr.base.ref;
             const currentTitle = pr.title;