CI(dependabot): Bump actions/checkout from 2 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...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/build.yml

@@ -18,7 +18,7 @@ jobs:
     permissions:
       contents: write
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Python 3.10
         uses: actions/setup-python@v5
         with:
@@ -72,7 +72,7 @@ jobs:
       CIBW_SKIP: "*-musllinux_*"
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - name: Set up Python 3.9
@@ -93,7 +93,7 @@ jobs:
     runs-on: ubuntu-22.04
     needs: [call-test-workflow, tag]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - name: Set up Python 3.9
@@ -114,7 +114,7 @@ jobs:
     runs-on: ubuntu-22.04
     needs: [call-test-workflow, tag, wheels, tarball]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - name: Set up Python 3.9

.github/workflows/keep-alive.yml

@@ -13,7 +13,7 @@ jobs:
     name: Keep workflow alive
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           ref: master