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] <[email protected]>

.github/workflows/auto_merge.yml

@@ -7,7 +7,7 @@ jobs:
   auto-merge:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: ahmadnassri/action-dependabot-auto-merge@v2
         with:
           github-token: ${{ secrets.DEPENDABOT_AUTOMERGE }}

.github/workflows/release.yml

@@ -6,7 +6,7 @@ jobs:
   publish-pypi:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@v3
       - name: Set up Python 3.8
         uses: actions/[email protected]
         with:

.github/workflows/test.yml

@@ -6,7 +6,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Set up Python
         uses: actions/[email protected]
         with:
@@ -22,7 +22,7 @@ jobs:
       matrix:
         python-version: [3.7, 3.8]
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/[email protected]
       with:
@@ -35,7 +35,7 @@ jobs:
   coverage:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@v3
       - name: Setup Python
         uses: actions/[email protected]
         with: