fix: rename test module name

Author: kewne

moneta-test/src/main/java/module-info.java

@@ -1,5 +1,5 @@
 
-module org.javamoney.moneta.test_extension {
+module org.javamoney.moneta.test {
     requires java.money;
     requires org.javamoney.moneta;
     provides javax.money.spi.RoundingProviderSpi with org.javamoney.moneta.test.TestRoundingProvider;