fix compilation failures

Author: michalvavrik

http/grpc/src/test/java/io/quarkus/ts/http/grpc/GrpcEnumIT.java

@@ -1,6 +1,6 @@
 package io.quarkus.ts.http.grpc;
 
-import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import org.jboss.logging.Logger;
@@ -50,7 +50,6 @@ public void testServerSideEnumLoggingInNativeMode() {
 
             assertEquals("logging-test", response.getName());
             assertEquals(DemoEnum.B, response.getEnum());
-
         }
     }
 }

service-discovery/stork-custom/src/test/java/io/quarkus/ts/stork/custom/StorkCustomServiceDiscoveryAndLoadBalancerIT.java

@@ -82,6 +82,7 @@ protected static String getAvailablePort() {
             return String.valueOf(socket.getLocalPort());
         } catch (IOException e) {
             fail("Unable to find available port", e);
+            return null;
         }
     }
 }

service-discovery/stork/src/test/java/io/quarkus/ts/stork/AbstractCommonTestCases.java

@@ -30,6 +30,7 @@ public static String getAvailablePort() {
             return String.valueOf(socket.getLocalPort());
         } catch (IOException e) {
             fail("Unable to find available port", e);
+            return null;
         }
     }
 }