fix(storage): preserve port in spring.cloud.gcp.storage.host (#4343)

spring-cloud-gcp-autoconfigure/src/main/java/com/google/cloud/spring/autoconfigure/storage/GcpStorageAutoConfiguration.java

@@ -113,6 +113,6 @@ private String verifyAndFetchHost(String host) {
               + host
               + ". Please verify that the specified host follows the 'https://${service}.${universeDomain}/' format");
     }
-    return url.getProtocol() + "://" + url.getHost() + "/";
+    return url.getProtocol() + "://" + url.getAuthority() + "/";
   }
 }

spring-cloud-gcp-autoconfigure/src/test/java/com/google/cloud/spring/autoconfigure/storage/GcpStorageAutoConfigurationTests.java

@@ -105,6 +105,17 @@ void testHost() {
             });
   }
 
+  @Test
+  void testHostWithPort() {
+    this.contextRunner
+        .withPropertyValues("spring.cloud.gcp.storage.host=http://localhost:54321")
+        .run(
+            context -> {
+              Storage storage = context.getBean("storage", Storage.class);
+              assertThat(storage.getOptions().getHost()).isEqualTo("http://localhost:54321/");
+            });
+  }
+
   @Test
   void testUniverseDomainAndHostSet() {
     this.contextRunner