build(deps): 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/docs.yml

@@ -10,7 +10,7 @@ jobs:
   docs:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           fetch-depth: 0
       - uses: actions/setup-python@v3

.github/workflows/release.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Check out the repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
 
     - name: Set up Python 3.7
       uses: actions/setup-python@v3

.github/workflows/tests.yml

@@ -14,7 +14,7 @@ jobs:
 
     steps:
     - name: Check out the repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
 
     - name: Set up Python ${{ matrix.pyv }}
       uses: actions/setup-python@v3

.github/workflows/update-template.yaml

@@ -11,7 +11,7 @@ jobs:
   update:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Install deps
       run: pip install cruft
     - name: Update template