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

Author: renovate[bot]

.github/workflows/semgrep.yml

@@ -20,5 +20,5 @@ jobs:
     container:
       image: returntocorp/semgrep
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - run: semgrep ci

.github/workflows/trivy.yml

@@ -15,7 +15,7 @@ jobs:
       security-events: write
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Run Trivy vulnerability scanner in repo mode
         uses: aquasecurity/trivy-action@master

.github/workflows/update-check.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Download "helm-chart-update-check"
         uses: engineerd/configurator@v0.0.10