Bump the actions group with 3 updates (#15728)

Bumps the actions group with 3 updates: [toshimaru/auto-author-assign](https://github.com/toshimaru/auto-author-assign), [actions/cache](https://github.com/actions/cache) and [tj-actions/changed-files](https://github.com/tj-actions/changed-files).


Updates `toshimaru/auto-author-assign` from 2.0.1 to 2.1.0
- [Release notes](https://github.com/toshimaru/auto-author-assign/releases)
- [Changelog](https://github.com/toshimaru/auto-author-assign/blob/main/CHANGELOG.md)
- [Commits](toshimaru/auto-author-assign@v2.0.1...v2.1.0)

Updates `actions/cache` from 3 to 4
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v3...v4)

Updates `tj-actions/changed-files` from 41.0.1 to 42.0.2
- [Release notes](https://github.com/tj-actions/changed-files/releases)
- [Changelog](https://github.com/tj-actions/changed-files/blob/main/HISTORY.md)
- [Commits](tj-actions/changed-files@v41.0.1...v42.0.2)

---
updated-dependencies:
- dependency-name: toshimaru/auto-author-assign
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: actions
- dependency-name: actions/cache
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
- dependency-name: tj-actions/changed-files
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/auto_author_assign.yml

@@ -12,4 +12,4 @@ jobs:
   assign-author:
     runs-on: ubuntu-latest
     steps:
-      - uses: toshimaru/auto-author-assign@v2.0.1
+      - uses: toshimaru/auto-author-assign@v2.1.0

.github/workflows/galata.yml

@@ -25,7 +25,7 @@ jobs:
         uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
 
       - name: Set up browser cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: |
             ${{ github.workspace }}/pw-browsers
@@ -116,7 +116,7 @@ jobs:
         uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
 
       - name: Set up browser cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: |
             ${{ github.workspace }}/pw-browsers

.github/workflows/reject-staging-changes.yml

@@ -16,7 +16,7 @@ jobs:
 
       - name: Get modified files in the staging directory
         id: modified-files-in-staging
-        uses: tj-actions/changed-files@v41.0.1
+        uses: tj-actions/changed-files@v42.0.2
         with:
           # only checks for modified files in this directory
           files: jupyterlab/staging