chore(deps): update actions/checkout action to v2.6.0

Author: renovate[bot]

.github/workflows/codeql-analysis.yml

@@ -16,7 +16,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2.3.4
+        uses: actions/checkout@v2.6.0
 
       # Initializes the CodeQL tools for scanning.
       - name: Initialize CodeQL

.github/workflows/ossar-analysis.yml

@@ -16,7 +16,7 @@ jobs:
     steps:
       # Checkout your code repository to scan
       - name: Checkout repository
-        uses: actions/checkout@v2.3.4
+        uses: actions/checkout@v2.6.0
         with:
           # We must fetch at least the immediate parents so that if this is
           # a pull request then we can checkout the head.

.github/workflows/pull-request.yml

@@ -10,7 +10,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2.3.4
+        uses: actions/checkout@v2.6.0
       - name: Set up Node
         uses: actions/[email protected]
         with:

.github/workflows/release.yml

@@ -13,7 +13,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2.3.4
+        uses: actions/checkout@v2.6.0
         with:
           fetch-depth: 0
       - name: Set up Node