chore(deps): bump actions/create-github-app-token from 1 to 2

Bumps [actions/create-github-app-token](https://github.com/actions/create-github-app-token) from 1 to 2.
- [Release notes](https://github.com/actions/create-github-app-token/releases)
- [Commits](actions/create-github-app-token@v1...v2)

---
updated-dependencies:
- dependency-name: actions/create-github-app-token
  dependency-version: '2'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/update-dependencies.yml

@@ -15,7 +15,7 @@ jobs:
         python-version: "3.11"
         install-just: true
 
-    - uses: actions/create-github-app-token@v1
+    - uses: actions/create-github-app-token@v2
       id: generate-token
       with:
         app-id: 1031449  # opensafely-core Create PR app