CI: Gradle build should "build"

Author: ktoso

.github/workflows/pull_request.yml

@@ -60,7 +60,7 @@ jobs:
             ${{ runner.os }}-swiftpm-
       # run the actual build
       - name: Gradle build
-        run: ./gradlew update --info --no-daemon
+        run: ./gradlew build --info --no-daemon
 
   test-swift:
     name: Swift tests (swift:${{ matrix.swift_version }} jdk:${{matrix.jdk_vendor}} os:${{ matrix.os_version }})