Modernize test-fixture project. (#465)

.github/workflows/main.yml

@@ -59,7 +59,7 @@ jobs:
     - uses: actions/setup-java@v4
       with:
         distribution: 'zulu'
-        java-version: 23
+        java-version: 25
 
     - uses: actions/cache@v4
       id: avd-cache

.github/workflows/manually.yml

@@ -53,7 +53,7 @@ jobs:
     - uses: actions/setup-java@v4
       with:
         distribution: 'zulu'
-        java-version: 23
+        java-version: 25
 
     - uses: gradle/actions/setup-gradle@v4