Use released parent poms

Author: suztomo

gapic-libraries-bom/pom.xml

@@ -15,7 +15,7 @@
   <parent>
     <artifactId>google-cloud-pom-parent</artifactId>
     <groupId>com.google.cloud</groupId>
-    <version>1.54.1</version><!-- {x-version-update:google-cloud-java:current} -->
+    <version>1.54.0</version><!-- {x-version-update:google-cloud-java:current} -->
     <relativePath>../google-cloud-pom-parent/pom.xml</relativePath>
   </parent>
 
@@ -1312,4 +1312,4 @@
       </dependency>
     </dependencies>
   </dependencyManagement>
-</project>
+</project>

java-vertexai/pom.xml

@@ -13,7 +13,7 @@
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-jar-parent</artifactId>
-    <version>1.54.1</version><!-- {x-version-update:google-cloud-java:current} -->
+    <version>1.54.0</version><!-- {x-version-update:google-cloud-java:current} -->
     <relativePath>../google-cloud-jar-parent/pom.xml</relativePath>
   </parent>