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

Author: renovate[bot]

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
 
     name: Test TypeScript build
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Install pnpm
         uses: pnpm/action-setup@v4
         with:

.github/workflows/npm-publish.yml

@@ -11,7 +11,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Install pnpm
         uses: pnpm/action-setup@v4
         with:
@@ -30,7 +30,7 @@ jobs:
     needs: build
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Install pnpm
         uses: pnpm/action-setup@v4
         with: