StrictMode policy violation: android.os.strictmode.NonSdkApiUsedViolation: Ljava/lang/invoke/MethodHandles$Lookup

[mtrakal]

retrofitVer = "2.9.0" // https://github.com/square/retrofit/releases
api "com.squareup.retrofit2:retrofit:$retrofitVer"

Testing on Android API level 30, AVD

        Retrofit.Builder retrofitBuilder = new Retrofit.Builder().baseUrl(mBaseUrl);

D/StrictMode: StrictMode policy violation: android.os.strictmode.NonSdkApiUsedViolation: Ljava/lang/invoke/MethodHandles$Lookup;-><init>(Ljava/lang/Class;I)V
        at android.os.StrictMode.lambda$static$1(StrictMode.java:411)
        at android.os.-$$Lambda$StrictMode$lu9ekkHJ2HMz0jd3F8K8MnhenxQ.accept(Unknown Source:2)
        at java.lang.Class.getDeclaredConstructorInternal(Native Method)
        at java.lang.Class.getConstructor0(Class.java:2329)
        at java.lang.Class.getDeclaredConstructor(Class.java:2170)
        at retrofit2.Platform.<init>(Platform.java:58)
        at retrofit2.Platform$Android.<init>(Platform.java:114)
        at retrofit2.Platform.findPlatform(Platform.java:43)
        at retrofit2.Platform.<clinit>(Platform.java:35)
        at retrofit2.Platform.get(Platform.java:38)
        at retrofit2.Retrofit$Builder.<init>(Retrofit.java:441)