Bump actions/checkout from 2 to 3

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 3.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...v3)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/ci.yaml

@@ -26,7 +26,7 @@ jobs:
         uses: styfle/cancel-workflow-action@0.9.1
         with:
           access_token: ${{ github.token }}
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           fetch-depth: 0 # Fetch all history for all branches and tags.
 
@@ -78,7 +78,7 @@ jobs:
         uses: styfle/cancel-workflow-action@0.9.1
         with:
           access_token: ${{ github.token }}
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           fetch-depth: 0 # Fetch all history for all branches and tags.
 

.github/workflows/pypi.yml

@@ -10,7 +10,7 @@ jobs:
     if: github.repository == 'intake/intake-esm'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Set up Python
         uses: actions/setup-python@v3
         with: