deps: bump Spanner to 6.25 (#161)

Author: olavloite

pom.xml

@@ -24,7 +24,7 @@
 
     <excludedTests>com.google.cloud.spanner.pgadapter.IntegrationTest,com.google.cloud.spanner.pgadapter.golang.GolangTest</excludedTests>
 
-    <spanner.version>6.24.0</spanner.version>
+    <spanner.version>6.25.0</spanner.version>
   </properties>
 
   <modelVersion>4.0.0</modelVersion>
@@ -103,7 +103,7 @@
     <dependency>
       <groupId>com.google.api</groupId>
       <artifactId>gax-grpc</artifactId>
-      <version>2.16.0</version>
+      <version>2.18.1</version>
       <classifier>testlib</classifier>
       <scope>test</scope>
     </dependency>

src/test/java/com/google/cloud/spanner/pgadapter/JdbcSimpleModeMockServerTest.java

@@ -46,7 +46,6 @@
 import java.util.TimeZone;
 import java.util.stream.Collectors;
 import org.junit.BeforeClass;
-import org.junit.Ignore;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
@@ -127,7 +126,6 @@ public void testEmptyStatementFollowedByNonEmptyStatement() throws SQLException
   }
 
   @Test
-  @Ignore("Skip until https://github.com/googleapis/java-spanner/pull/1877 has been released")
   public void testWrongDialect() {
     // Let the mock server respond with the Google SQL dialect instead of PostgreSQL. The
     // connection should be gracefully rejected. Close all open pooled Spanner objects so we know