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

Author: renovate[bot]

.github/workflows/nodejs.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v6
 
       - name: Use Node.js
         uses: actions/setup-node@v2

.github/workflows/release.yml

@@ -13,7 +13,7 @@ jobs:
     name: Release
     runs-on: ubuntu-18.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v6
 
       - name: Setup Node.js
         uses: actions/setup-node@v2