Update build.yml

Of course they changed the name. Of course they did.

Author: falkreon

.github/workflows/build.yml

@@ -21,7 +21,7 @@ jobs:
       - name: checkout repository
         uses: actions/checkout@v4
       - name: validate gradle wrapper
-        uses: gradle/wrapper-validation-action@v4
+        uses: gradle/wrapper-validation@v4
       - name: setup jdk ${{ matrix.java }}
         uses: actions/setup-java@v2
         with: