Fix test compilation

Author: gthea

src/test/java/io/split/android/client/storage/general/GeneralInfoStorageImplTest.java

@@ -267,7 +267,7 @@ public void testSerializeAndStoreHttpProxy() {
 
         HttpProxy httpProxy = HttpProxy.newBuilder(testHost, testPort)
                 .basicAuth(testUsername, testPassword)
-                .mtlsAuth(clientCertStream, clientKeyStream)
+                .mtls(clientCertStream, clientKeyStream)
                 .proxyCacert(caCertStream)
                 .credentialsProvider(credentialsProvider)
                 .build();

src/test/java/io/split/android/client/utils/HttpProxySerializerTest.java

@@ -56,7 +56,7 @@ public String getPassword() {
         // Create the HttpProxy object
         mHttpProxy = HttpProxy.newBuilder(TEST_HOST, TEST_PORT)
                 .basicAuth(TEST_USERNAME, TEST_PASSWORD)
-                .mtlsAuth(clientCertStream, clientKeyStream)
+                .mtls(clientCertStream, clientKeyStream)
                 .proxyCacert(caCertStream)
                 .credentialsProvider(credentialsProvider)
                 .build();