Duplicated warning message on unsigned integer

[alexander-yevsyukov]

I've got two same warning messages when building CoreJava. Here's the console output:

> Task :server:launchTestFixturesProtoData
w: file:///Users/sanders/Projects/Spine/core-java/server/src/testFixtures/proto/spine/test/tuple/quintet.proto:53:5: Unsigned integer types are not supported in Java. The Protobuf compiler uses signed integers to represent unsigned types in Java (https://protobuf.dev/programming-guides/proto3/#scalar). Operations on unsigned values rely on static utility methods from `java.lang.Integer` and `java.lang.Long` classes (https://www.baeldung.com/java-unsigned-arithmetic#the-unsigned-integer-api). Be cautious when dealing with unsigned values outside of these methods, as Java treats all primitive integers as signed.
w: file:///Users/sanders/Projects/Spine/core-java/server/src/testFixtures/proto/spine/test/tuple/quintet.proto:53:5: Unsigned integer types are not supported in Java. The Protobuf compiler uses signed integers to represent unsigned types in Java (https://protobuf.dev/programming-guides/proto3/#scalar). Operations on unsigned values rely on static utility methods from `java.lang.Integer` and `java.lang.Long` classes (https://www.baeldung.com/java-unsigned-arithmetic#the-unsigned-integer-api). Be cautious when dealing with unsigned values outside of these methods, as Java treats all primitive integers as signed.

It has the same warning for the same location in the quintent.proto file emitted twice. The user should have it reported only once.