revert change to gapic-libraries-bom/pom.xml

Author: zhumin8

gapic-libraries-bom/pom.xml

@@ -15,7 +15,7 @@
   <parent>
     <artifactId>google-cloud-pom-parent</artifactId>
     <groupId>com.google.cloud</groupId>
-    <version>1.88.0-SNAPSHOT</version><!-- {x-version-update:google-cloud-pom-parent:current} -->
+    <version>1.88.0-SNAPSHOT</version><!-- {x-version-update:google-cloud-java:current} -->
     <relativePath>../google-cloud-pom-parent/pom.xml</relativePath>
   </parent>