Bump actions/checkout from 2 to 2.3.4

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 2.3.4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...v2.3.4)

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
     steps:
       - uses: actions/setup-python@v2
       - run: python -m pip install --upgrade pip setuptools wheel twine readme-renderer
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
       - run: python setup.py sdist bdist_wheel
       - run: python -m twine check dist/*
 
@@ -23,7 +23,7 @@ jobs:
       - uses: actions/setup-node@v2.1.5
         with:
           node-version: '14.x'
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
       - id: cache-npm
         uses: actions/cache@v2.1.5
         with:
@@ -47,7 +47,7 @@ jobs:
           - pydocstyle .
     steps:
       - uses: actions/setup-python@v2
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
       - uses: actions/cache@v2.1.5
         with:
           path: ~/.cache/pip
@@ -74,7 +74,7 @@ jobs:
           - "3.1"
           - "3.2"
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v2.3.4
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2
       with:

.github/workflows/release.yml

@@ -9,7 +9,7 @@ jobs:
 
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2.3.4
     - uses: actions/setup-python@v1
     - name: Install Python dependencies
       run: python -m pip install --upgrade pip setuptools wheel twine