ci: bump GitHub Actions to Node 24 majors (#207)

Silences Node 20 deprecation warnings in workflow runs:

- googleapis/release-please-action: v4 -> v5
- amannn/action-semantic-pull-request: v5 -> v6
- peter-evans/create-pull-request: v7 -> v8

No input/config changes are needed for the way these actions are used
in this repo.

Refs #176

Author: rubenhensen

.github/workflows/ci.yml

@@ -57,7 +57,7 @@ jobs:
       release_created: ${{ steps.release.outputs.release_created }}
       version: ${{ steps.release.outputs.version }}
     steps:
-      - uses: googleapis/release-please-action@v4
+      - uses: googleapis/release-please-action@v5
         id: release
         with:
           release-type: node

.github/workflows/pr-title.yml

@@ -9,6 +9,6 @@ jobs:
     name: Conventional Commit
     runs-on: ubuntu-latest
     steps:
-      - uses: amannn/action-semantic-pull-request@v5
+      - uses: amannn/action-semantic-pull-request@v6
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}