Updated checkout action [skip ci]

Author: ankane

.github/workflows/build.yml

@@ -12,7 +12,7 @@ jobs:
           - elixir: 1.15
             otp: 24
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: erlef/setup-beam@v1
         with:
           otp-version: ${{ matrix.otp }}