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

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

.github/workflows/test_and_release.yml

@@ -5,7 +5,7 @@ jobs:
   unit-test:
     runs-on: ubuntu-20.04
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v2.3.4
     - name: Load Go version
       id: go-version
       run: |
@@ -23,7 +23,7 @@ jobs:
   spec-test:
     runs-on: ubuntu-20.04
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v2.3.4
     - name: Load Go version
       id: go-version
       run: |
@@ -44,7 +44,7 @@ jobs:
   doc-test:
     runs-on: ubuntu-20.04
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v2.3.4
     - name: Prepare Python env
       run: |
         sudo apt-get install -y pipenv
@@ -59,7 +59,7 @@ jobs:
     runs-on: ubuntu-20.04
     needs: [ unit-test, spec-test, doc-test ]
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v2.3.4
       with:
         fetch-depth: 0
     - name: Load Go version
@@ -105,7 +105,7 @@ jobs:
       matrix:
         binary: ["kapow_windows_386", "kapow_windows_amd64"]
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v2.3.4
     - name: Download a single artifact
       uses: actions/download-artifact@v2
       with: