ci(deps): 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/ci.yml

@@ -23,7 +23,7 @@ jobs:
   check:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install stable toolchain
         uses: dtolnay/rust-toolchain@stable
         with:
@@ -51,7 +51,7 @@ jobs:
     if: github.event_name != 'merge_group'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install stable toolchain
         uses: dtolnay/rust-toolchain@stable
       - uses: mozilla-actions/[email protected]
@@ -76,7 +76,7 @@ jobs:
             isMerge: true
     name: tests (Rust ${{ matrix.rust }})
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - id: toolchain
         uses: dtolnay/rust-toolchain@master
         with:
@@ -99,7 +99,7 @@ jobs:
     runs-on: ubuntu-latest
     name: "python bindings"
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: mozilla-actions/[email protected]
       - name: Install stable toolchain
         uses: dtolnay/rust-toolchain@stable