Bump actions/checkout from 3 to 4 (#194)

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

.github/workflows/CI.yml

@@ -22,7 +22,7 @@ jobs:
       matrix:
         python-version: ['3.8', '3.11', 'pypy3.9']
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: recursive
       - uses: actions/setup-python@v4
@@ -56,7 +56,7 @@ jobs:
           - target: armv7
             interpreter: 3.8 3.9 3.10 3.11 3.12 pypy3.8 pypy3.9
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: recursive
       - name: Build wheels
@@ -88,7 +88,7 @@ jobs:
         # { target: "armv7-unknown-linux-musleabihf", image_tag: "armv7" },
         # { target: "powerpc64le-unknown-linux-musl", image_tag: "ppc64le" },
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: recursive
       - name: Setup QEMU
@@ -117,7 +117,7 @@ jobs:
           - target: x86
             interpreter: 3.8 3.9 3.10 3.11
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: recursive
       - name: Build wheels
@@ -143,7 +143,7 @@ jobs:
           - target: aarch64
             interpreter: 3.8 3.9 3.10 3.11 pypy3.8 pypy3.9
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: recursive
       - name: Build wheels
@@ -162,7 +162,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: lint_and_test
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: recursive
       - name: Build sdist