updated google-cloud-spanner/pom.xml [ci skip]

@@ -3,15 +3,15 @@
 <modelVersion>4.0.0</modelVersion>
 <groupId>com.google.cloud</groupId>
 <artifactId>google-cloud-spanner</artifactId>
-<version>1.53.1-SNAPSHOT</version><!-- {x-version-update:google-cloud-spanner:current} -->
+<version>1.54.0</version><!-- {x-version-update:google-cloud-spanner:current} -->
 <packaging>jar</packaging>
 <name>Google Cloud Spanner</name>
 <url>https://.com/googleapis/java-spanner</url>
 <description>Java idiomatic client for Google Cloud Spanner.</description>
 <parent>
 <groupId>com.google.cloud</groupId>
 <artifactId>google-cloud-spanner-parent</artifactId>
-<version>1.53.1-SNAPSHOT</version><!-- {x-version-update:google-cloud-spanner:current} -->
+<version>1.54.0</version><!-- {x-version-update:google-cloud-spanner:current} -->
 </parent>
 <properties>
 <site.installationModule>google-cloud-spanner</site.installationModule>