chore(deps): update actions/checkout action to v6 (#216)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/analysis.yml

@@ -13,7 +13,7 @@ jobs:
     name: nilaway
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: install nilaway
         run: go install go.uber.org/nilaway/cmd/nilaway@latest

.github/workflows/lint.yml

@@ -13,7 +13,7 @@ jobs:
     name: lint
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-go@v6
         with:
           go-version: stable

.github/workflows/test.yml

@@ -20,7 +20,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install Go
         uses: actions/setup-go@v6