ci: fix PR not triggering workflows by switching back to pytestbot access token

The builtin actions token is not allowed to trigger further workflows.
So when we create a PR using that token, the PR checks don't run, and a
maintainer must close & open the PR to make them run. This is quite
annoying, so switch back to the "machine user" approach.

Fixes #9554.

Author: bluetech

.github/workflows/backport.yml

@@ -48,4 +48,4 @@ jobs:
           --title "${subject}" \
           --body "Backport of PR #${{ github.event.number }} to $target_branch branch. PR created by backport workflow."
       env:
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        GITHUB_TOKEN: ${{ secrets.CHATOPS }}

.github/workflows/prepare-release-pr.yml

@@ -44,9 +44,9 @@ jobs:
     - name: Prepare release PR (minor/patch release)
       if: github.event.inputs.major == 'no'
       run: |
-        tox -e prepare-release-pr -- ${{ github.event.inputs.branch }} ${{ github.token }} --prerelease='${{ github.event.inputs.prerelease }}'
+        tox -e prepare-release-pr -- ${{ github.event.inputs.branch }} ${{ secrets.CHATOPS }} --prerelease='${{ github.event.inputs.prerelease }}'
 
     - name: Prepare release PR (major release)
       if: github.event.inputs.major == 'yes'
       run: |
-        tox -e prepare-release-pr -- ${{ github.event.inputs.branch }} ${{ github.token }} --major --prerelease='${{ github.event.inputs.prerelease }}'
+        tox -e prepare-release-pr -- ${{ github.event.inputs.branch }} ${{ secrets.CHATOPS }} --major --prerelease='${{ github.event.inputs.prerelease }}'

.github/workflows/update-plugin-list.yml

@@ -38,7 +38,7 @@ jobs:
         run: python scripts/update-plugin-list.py
 
       - name: Create Pull Request
-        uses: peter-evans/create-pull-request@2455e1596942c2902952003bbb574afbbe2ab2e6
+        uses: peter-evans/create-pull-request@671dc9c9e0c2d73f07fa45a3eb0220e1622f0c5f
         with:
           commit-message: '[automated] Update plugin list'
           author: 'pytest bot <[email protected]>'
@@ -47,3 +47,4 @@ jobs:
           branch-suffix: short-commit-hash
           title: '[automated] Update plugin list'
           body: '[automated] Update plugin list'
+          token: ${{ secrets.CHATOPS }}