Bump actions/checkout from 2 to 2.3.4 (#257)

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](https://github.com/actions/checkout/compare/v2...v2.3.4

)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/ci.yml

@@ -17,7 +17,7 @@
           - {VERSION: "3.9", TOXENV: "py39"}
     name: "Python ${{ matrix.PYTHON.VERSION }} on macOS"
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
       - name: Setup python
         uses: actions/setup-python@v2.2.2
         with:
@@ -40,7 +40,7 @@
           - {VERSION: "3.9", TOXENV: "py39"}
     name: "Python ${{ matrix.PYTHON.VERSION }} on ${{ matrix.WINDOWS.WINDOWS }}"
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
       - name: Setup python
         uses: actions/setup-python@v2.2.2
         with:
@@ -65,7 +65,7 @@
           - {VERSION: "pypy3", TOXENV: "pypy3"}
     name: "${{ matrix.PYTHON.TOXENV }} on linux"
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
       - name: Setup python
         uses: actions/setup-python@v2.2.2
         with:
@@ -83,7 +83,7 @@
         PYTHON:
           - {VERSION: "cp36-cp36m", TOXENV: 'py36'}
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v1
         with:

.github/workflows/wheel-builder.yml

@@ -46,7 +46,7 @@
             BIN_PATH: '/Library/Frameworks/Python.framework/Versions/3.8/bin/python3'
     name: "${{ matrix.PYTHON.ABI_VERSION }} macOS"
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@v2.3.4
       - run: |
           curl "${{ matrix.PYTHON.DOWNLOAD_URL }}" -o python.pkg
           sudo installer -pkg python.pkg -target /
@@ -76,7 +76,7 @@
           - {VERSION: "3.6", ABI_VERSION: "cp36"}
     name: "${{ matrix.PYTHON.VERSION }} ${{ matrix.PYTHON.ABI_VERSION }} ${{ matrix.WINDOWS}}"
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@v2.3.4
       - name: Setup python
         uses: actions/setup-python@v2.2.2
         with:
@@ -106,7 +106,7 @@
         PYTHON:
           - {VERSION: "cp36-cp36m", ABI_VERSION: 'cp36'}
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
       - run: |
           docker run --rm --privileged hypriot/qemu-register
       - uses: docker://quay.io/pypa/manylinux2014_aarch64