deps: update dependency com.google.cloud:google-cloud-shared-dependencies to v3.2.0 (#2264)

* deps: update dependency com.google.cloud:google-cloud-shared-dependencies to v3.2.0

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README.md

@@ -49,7 +49,7 @@ If you are using Maven without 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:26.5.0')
+implementation platform('com.google.cloud:libraries-bom:26.6.0')
 
 implementation 'com.google.cloud:google-cloud-spanner'
 ```

pom.xml

@@ -54,7 +54,7 @@
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
     <github.global.server>github</github.global.server>
     <site.installationModule>google-cloud-spanner-parent</site.installationModule>
-    <google.cloud.shared-dependencies.version>3.1.2</google.cloud.shared-dependencies.version>
+    <google.cloud.shared-dependencies.version>3.2.0</google.cloud.shared-dependencies.version>
   </properties>
 
   <dependencyManagement>