build(deps): update dependency org.apache.maven.plugins:maven-assembly-plugin to v3.7.0 (#2946)

* build(deps): update dependency org.apache.maven.plugins:maven-assembly-plugin to v3.7.0

* 🦉 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>

Author: renovate-bot

README.md

@@ -50,7 +50,7 @@ If you are using Maven without the BOM, add this to your dependencies:
 If you are using Gradle 5.x or later, add this to your dependencies:
 
 ```Groovy
-implementation platform('com.google.cloud:libraries-bom:26.33.0')
+implementation platform('com.google.cloud:libraries-bom:26.34.0')
 
 implementation 'com.google.cloud:google-cloud-spanner'
 ```

google-cloud-spanner-executor/pom.xml

@@ -164,7 +164,7 @@
     <plugins>
       <plugin>
         <artifactId>maven-assembly-plugin</artifactId>
-        <version>3.6.0</version>
+        <version>3.7.0</version>
         <configuration>
           <descriptors>
             <descriptor>assembly-descriptor.xml</descriptor>