Use StableValue as implementation for CachedSupplier

[Jannyboy11]

In the util package, there lives CachedSupplier utility class. This one is better replaced by the StableValue (https://openjdk.org/jeps/8312611) class from the JDK for better performance.

For compatibility, GuiLib must release as a Multi-Release jar file such that we can fall back on the old CachedSupplier implementation when running on Java versions where StableValue is not yet available.