build(deps-dev): bump com.google.cloud:google-cloud-nio

Bumps [com.google.cloud:google-cloud-nio](https://github.com/googleapis/java-storage-nio) from 0.127.20 to 0.127.21.
- [Release notes](https://github.com/googleapis/java-storage-nio/releases)
- [Changelog](https://github.com/googleapis/java-storage-nio/blob/main/CHANGELOG.md)
- [Commits](googleapis/java-storage-nio@v0.127.20...v0.127.21)

---
updated-dependencies:
- dependency-name: com.google.cloud:google-cloud-nio
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

spring-content-gcs/pom.xml

@@ -109,7 +109,7 @@
         <dependency>
             <groupId>com.google.cloud</groupId>
             <artifactId>google-cloud-nio</artifactId>
-            <version>0.127.20</version>
+            <version>0.127.21</version>
             <scope>test</scope>
         </dependency>
 	</dependencies>