Bump actions/checkout from 1 to 2.3.4

Bumps [actions/checkout](https://github.com/actions/checkout) from 1 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/v1...v2.3.4)

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

.github/workflows/docs.yml

@@ -6,7 +6,7 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v1
+      uses: actions/checkout@v2.3.4
 
     - name: Installing Node
       uses: actions/setup-node@v2.1.5

.github/workflows/lint.yml

@@ -6,7 +6,7 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v1
+      uses: actions/checkout@v2.3.4
 
     - name: Installing Node
       uses: actions/setup-node@v2.1.5

.github/workflows/linux.yml

@@ -6,7 +6,7 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v1
+      uses: actions/checkout@v2.3.4
 
     - name: Install Node
       uses: actions/setup-node@v2.1.5

.github/workflows/macos.yml

@@ -11,7 +11,7 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v1
+      uses: actions/checkout@v2.3.4
 
     - name: Installing Node
       uses: actions/setup-node@v2.1.5

.github/workflows/windows.yml

@@ -6,7 +6,7 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v1
+      uses: actions/checkout@v2.3.4
 
     - name: Installing Node
       uses: actions/setup-node@v2.1.5