Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/mirrorer.yaml

@@ -22,7 +22,7 @@ jobs:
   push_to_mirror:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 0
     # - name: Push the content to the mirror repository

.github/workflows/web_deploy.yml

@@ -32,7 +32,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Setup Node.js
         uses: actions/setup-node@v6