deps: update dependency com.google.cloud:google-cloud-nio to v0.121.2 (#647)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-nio](https://github.com/googleapis/java-storage-nio) | patch | `0.121.1` -> `0.121.2` |

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pom.xml

@@ -448,7 +448,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-nio</artifactId>
-        <version>0.121.1</version>
+        <version>0.121.2</version>
       </dependency>
       <dependency>
         <groupId>com.google.cloud</groupId>