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

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

Author: renovate[bot]

.github/workflows/main.yml

@@ -14,7 +14,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v6

.github/workflows/release.yaml

@@ -11,7 +11,7 @@ jobs:
 
     steps:
       - name: Check out the repo
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v6

.github/workflows/semgrep.yaml

@@ -12,7 +12,7 @@ jobs:
     if: (github.actor != 'dependabot[bot]')
     steps:
       # Fetch project source
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - uses: returntocorp/semgrep-action@v1
         with: