Update actions/checkout action to v3

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
     steps:
       - name: Repo clone (go mod tidy / gofmt)
         if: github.event_name != 'pull_request'
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           fetch-depth: 0
 
@@ -55,7 +55,7 @@ jobs:
           branch: ${{ github.ref }}
 
       - name: Repo clone (test)
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           fetch-depth: 0
 

.github/workflows/codeql-analysis.yml

@@ -31,7 +31,7 @@ jobs:
 
     steps:
       - name: Clone repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v1