Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Set up pnpm
         uses: pnpm/action-setup@v4
@@ -50,7 +50,7 @@ jobs:
     needs: build
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Set up pnpm
         uses: pnpm/action-setup@v4

.github/workflows/publish.yml

@@ -79,7 +79,7 @@ jobs:
       contents: read
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Set up pnpm
         uses: pnpm/action-setup@v4