chore(deps): update dependency com.google.cloud:google-cloud-bigquerydatatransfer to v1.0.15 (#463)

Author: renovate-bot

samples/install-without-bom/pom.xml

@@ -28,7 +28,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-bigquerydatatransfer</artifactId>
-      <version>1.0.14</version>
+      <version>1.0.15</version>
     </dependency>
     <!-- [END bigquerydatatransfer_install_without_bom] -->