Make sure failsafe and surefire plugin versions match (#7029)

Author: chingor13

google-cloud-contrib/google-cloud-spanner-jdbc/pom.xml

@@ -64,7 +64,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-failsafe-plugin</artifactId>
-        <version>3.0.0-M3</version>
+        <version>3.0.0-M4</version>
         <configuration>
           <systemPropertyVariables>
             <spanner.testenv.config.class>com.google.cloud.spanner.GceTestEnvConfig</spanner.testenv.config.class>

google-cloud-spanner/pom.xml

@@ -53,7 +53,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-failsafe-plugin</artifactId>
-        <version>3.0.0-M3</version>
+        <version>3.0.0-M4</version>
         <configuration>
           <systemPropertyVariables>
             <spanner.testenv.config.class>com.google.cloud.spanner.GceTestEnvConfig</spanner.testenv.config.class>