updated pom.xml

Author: release-please[bot]

pom.xml

@@ -4,7 +4,7 @@
 
  <artifactId>google-cloud-bigtable-parent</artifactId>
  <packaging>pom</packaging>
- <version>1.13.1-SNAPSHOT</version><!-- {x-version-update:google-cloud-bigtable:current} -->
+ <version>1.13.1</version><!-- {x-version-update:google-cloud-bigtable:current} -->
  <name>Google Cloud Bigtable Parent</name>
  <url>https://github.com/googleapis/java-bigtable</url>
  <description>