ci(dependabot): bump actions/checkout from 3 to 4 (pymmcore-plus#134)

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/docs.yml

@@ -11,7 +11,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
         with:
           python-version: 3.x

.github/workflows/test_and_deploy.yml

@@ -18,7 +18,7 @@ jobs:
     name: Check Manifest
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - run: pip3 install check-manifest && check-manifest
 
   test:
@@ -39,7 +39,7 @@ jobs:
             pydantic: "'pydantic<2'"
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v4
@@ -65,8 +65,8 @@ jobs:
     name: Test pymmcore-plus
     runs-on: macos-latest
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
+      - uses: actions/checkout@v4
         with:
           repository: pymmcore-plus/pymmcore-plus
           path: pymmcore-plus-from-github
@@ -93,8 +93,8 @@ jobs:
     name: Test pymmcore-widgets
     runs-on: macos-latest
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
+      - uses: actions/checkout@v4
         with:
           repository: pymmcore-plus/pymmcore-widgets
           path: pymmcore-widgets-from-github
@@ -122,7 +122,7 @@ jobs:
     runs-on: ubuntu-latest
     if: ${{ github.repository == 'pymmcore-plus/useq-schema' && contains(github.ref, 'tags') }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0