fix:Fixed transaction tagging and reset datafaker version

Author: srozsnyai

samples/quickperf/pom.xml

@@ -38,7 +38,7 @@
     <dependency>
       <groupId>net.datafaker</groupId>
       <artifactId>datafaker</artifactId>
-      <version>2.3.1</version>
+      <version>1.7.0</version>
     </dependency>
     <dependency>
       <groupId>com.google.cloud</groupId>

samples/quickperf/src/main/java/com/google/cloud/jdbc/quickperf/QuickPerfRunner.java

@@ -163,6 +163,9 @@ public void run() {
             boolean hasResults = statement.execute();
             if (!connection.getAutoCommit()) {
               connection.commit();
+              connection
+                .createStatement()
+                .execute(String.format("SET %sTRANSACTION_TAG = '%s'", tagPrefix, config.DEFAULT_TAG));
             }
             long stop = System.nanoTime() - start;