Rename test file that used a non-ascii character in file name

Author: gsmet

extensions/resteasy-reactive/quarkus-resteasy-reactive/deployment/src/test/java/io/quarkus/resteasy/reactive/server/test/customexceptions/InvalidConditionalΜappersTest.java renamed to extensions/resteasy-reactive/quarkus-resteasy-reactive/deployment/src/test/java/io/quarkus/resteasy/reactive/server/test/customexceptions/InvalidConditionalMappersTest.java

@@ -18,7 +18,7 @@
 import io.quarkus.arc.profile.IfBuildProfile;
 import io.quarkus.test.QuarkusUnitTest;
 
-public class InvalidConditionalΜappersTest {
+public class InvalidConditionalMappersTest {
 
     @RegisterExtension
     static QuarkusUnitTest test = new QuarkusUnitTest()