Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/build.yml

@@ -12,7 +12,7 @@ jobs:
             matrix:
                 node-version: [lts/*]
         steps:
-            - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
+            - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
             - name: Use Node.js ${{ matrix.node-version }}
               uses: actions/setup-node@v4
               with: