Bump actions/checkout from 3 to 4

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]>

.github/workflows/release.yml

@@ -19,7 +19,7 @@ jobs:
 
     steps:
       - name: Check out src from Git
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0 # needed by setuptools-scm
       - name: Switch to using Python 3.10 by default
@@ -33,7 +33,7 @@ jobs:
           --user
           tox
       - name: Check out src from Git
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0 # needed by setuptools-scm
       - name: Build dists

.github/workflows/tox.yml

@@ -46,7 +46,7 @@ jobs:
 
     steps:
       - name: Check out src from Git
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0 # needed by setuptools-scm
       - name: Set up Python ${{ matrix.python-version }}
@@ -128,7 +128,7 @@ jobs:
 
     steps:
       - name: Check out src from Git
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0 # needed by setuptools-scm
       - name: Set up Python ${{ matrix.python-version }}
@@ -200,7 +200,7 @@ jobs:
           jobs: ${{ toJSON(needs) }}
 
       - name: Check out src from Git
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Notify repository owners about lint change affecting them
         uses: sourcegraph/[email protected]