Bump actions/checkout from 2 to 4 (#818)

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](https://github.com/actions/checkout/compare/v2...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/pytest.yaml

@@ -32,7 +32,7 @@ jobs:
         shell: bash -l {0}
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
           python-version: '3.9'

.github/workflows/release-dockerhub-nightly.yaml

@@ -18,7 +18,7 @@ jobs:
             username: sweagent
             password: ${{ secrets.DOCKERHUB_TOKEN }}
         - name: Checkout code
-          uses: actions/checkout@v2
+          uses: actions/checkout@v4
         - name: Run release script
           if: (github.ref == 'refs/heads/main') && (github.repository == 'princeton-nlp/SWE-agent')
           run: ./release_dockerhub.sh sweagent latest

.github/workflows/release-dockerhub-release.yaml

@@ -15,7 +15,7 @@ jobs:
             username: sweagent
             password: ${{ secrets.DOCKERHUB_TOKEN }}
         - name: Checkout code
-          uses: actions/checkout@v2
+          uses: actions/checkout@v4
         - name: Get release name
           run: echo "RELEASE_VERSION=${GITHUB_REF#refs/*/v}" >> $GITHUB_ENV
         - name: Run release script

.github/workflows/test_build_containers.yaml

@@ -27,7 +27,7 @@ jobs:
         shell: bash -l {0}
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Run setup.sh
         run: |
           ./setup.sh