build: enable multiScm for releases (#1019)

* build: enable multiScm for releases

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

README.md

@@ -26,20 +26,20 @@ If you are using Maven, add this to your pom.xml file:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-monitoring</artifactId>
-  <version>3.16.0</version>
+  <version>3.18.0</version>
 </dependency>
 ```
 
 If you are using Gradle without BOM, add this to your dependencies:
 
 ```Groovy
-implementation 'com.google.cloud:google-cloud-monitoring:3.16.0'
+implementation 'com.google.cloud:google-cloud-monitoring:3.18.0'
 ```
 
 If you are using SBT, add this to your dependencies:
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-monitoring" % "3.16.0"
+libraryDependencies += "com.google.cloud" % "google-cloud-monitoring" % "3.18.0"
 ```
 
 ## Authentication