deps: update dependency com.google.cloud:google-cloud-notification to…

… v0.121.2-beta (#1202)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-notification](com/google/cloud/google-cloud-notification) | patch | `0.121.1-beta` -> `0.121.2-beta` |

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pom.xml

@@ -419,7 +419,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-notification</artifactId>
-        <version>0.121.1-beta</version>
+        <version>0.121.2-beta</version>
       </dependency>
       <dependency>
         <groupId>com.google.cloud</groupId>