Bump actions/checkout from 3 to 4 (#285)

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.yaml

@@ -28,7 +28,7 @@ jobs:
       OE_LICENSE: ${{ github.workspace }}/oe_license.txt
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Install with OpenEye Toolkits
         if: ${{ matrix.openeye == true }}

.github/workflows/installer.yml

@@ -25,7 +25,7 @@ jobs:
       PYVER: ${{ matrix.python-version }}
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Install conda environment
       uses: mamba-org/setup-micromamba@v1