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] <[email protected]>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -12,14 +12,14 @@ 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/*
 
   standardjs:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
       - uses: actions/[email protected]
         with:
           node-version: '12.x'
@@ -31,7 +31,7 @@ jobs:
     steps:
       - uses: actions/setup-python@v2
       - run: python -m pip install -U setuptools wheel
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
       - run: sudo apt-get install -y gettext graphviz
       - run: python setup.py develop
       - run: python setup.py build_sphinx -W -b doctest -b html
@@ -62,7 +62,7 @@ jobs:
           mkdir bin
           curl -O https://chromedriver.storage.googleapis.com/`curl -s https://chromedriver.storage.googleapis.com/LATEST_RELEASE`/chromedriver_linux64.zip
           unzip chromedriver_linux64.zip -d bin
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2.3.4
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip setuptools wheel codecov

.github/workflows/release.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/setup-python@v2
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
       - name: Install Python dependencies
         run: python -m pip install --upgrade pip setuptools wheel twine
       - name: Build dist packages
@@ -25,7 +25,7 @@ jobs:
     steps:
       - uses: actions/[email protected]
       - uses: actions/setup-python@v1
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
       - run: python set_version.py
       - name: Upload packages
         run: npm publish