Update slackapi/slack-github-action action to v3.0.3 (#11419)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -373,7 +373,7 @@ jobs:
           echo END_OF_SLACK_MESSAGE >> "$GITHUB_OUTPUT"
       - name: Post about drafted release to Slack
         id: slack
-        uses: slackapi/slack-github-action@v3.0.2
+        uses: slackapi/slack-github-action@v3.0.3
         with:
           method: chat.postMessage
           token: ${{ secrets.SLACKTOKEN }}

.github/workflows/release.yml

@@ -70,7 +70,7 @@ jobs:
           text: ${{ github.event.release.body }}
       - name: Post about release to Slack
         id: slack
-        uses: slackapi/slack-github-action@v3.0.2
+        uses: slackapi/slack-github-action@v3.0.3
         with:
           method: chat.postMessage
           token: ${{ secrets.SLACKTOKEN }}