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

Author: cq-bot

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
   ci:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
           cache: "npm"

.github/workflows/publish.yml

@@ -12,7 +12,7 @@ jobs:
     name: Publish to npm
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
           node-version: "24"

.github/workflows/regen.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
           cache: "npm"