Bump actions/checkout from 4 to 5 (#823)

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 5.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  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>
Co-authored-by: Justus Magin <keewis@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/main.yaml

@@ -24,7 +24,7 @@ jobs:
       matrix:
         python-version: ["3.11", "3.12"]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           fetch-depth: 0 # checkout tags (which is not done by default)
       - name: 🔁 Setup Python

.github/workflows/release.yaml

@@ -8,7 +8,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Set up Python
         uses: actions/setup-python@v6
         with:

.github/workflows/test-integration.yaml

@@ -35,7 +35,7 @@ jobs:
           - "pangeo-forge-runner==0.9.2"
           - "pangeo-forge-runner==0.9.3"
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: 🔁 Setup Python
         id: setup-python
         uses: actions/setup-python@v6