chore: release 0.121.9 (#498)

🤖 I have created a release \*beep\* \*boop\*
---
### [0.121.9](https://www.github.com/googleapis/java-logging-logback/compare/v0.121.8...v0.121.9) (2021-08-23)


### Dependencies

* update dependency com.google.cloud:google-cloud-shared-dependencies to v2.1.0 ([#497](https://www.github.com/googleapis/java-logging-logback/issues/497)) ([b0a8b66](https://www.github.com/googleapis/java-logging-logback/commit/b0a8b66db199e0cc8c84d823d7ad0cd9483dd5e9))
---


This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).

CHANGELOG.md

@@ -1,5 +1,12 @@
 # Changelog
 
+### [0.121.9](https://www.github.com/googleapis/java-logging-logback/compare/v0.121.8...v0.121.9) (2021-08-23)
+
+
+### Dependencies
+
+* update dependency com.google.cloud:google-cloud-shared-dependencies to v2.1.0 ([#497](https://www.github.com/googleapis/java-logging-logback/issues/497)) ([b0a8b66](https://www.github.com/googleapis/java-logging-logback/commit/b0a8b66db199e0cc8c84d823d7ad0cd9483dd5e9))
+
 ### [0.121.8](https://www.github.com/googleapis/java-logging-logback/compare/v0.121.7...v0.121.8) (2021-08-12)
 
 

pom.xml

@@ -5,7 +5,7 @@
   <modelVersion>4.0.0</modelVersion>
 
   <artifactId>google-cloud-logging-logback</artifactId>
-  <version>0.121.9-alpha-SNAPSHOT</version><!-- {x-version-update:google-cloud-logging-logback:current} -->
+  <version>0.121.9-alpha</version><!-- {x-version-update:google-cloud-logging-logback:current} -->
   <packaging>jar</packaging>
   <name>Google Cloud Logging Logback Appender</name>
   <url>https://github.com/googleapis/java-logging-logback</url>

versions.txt

@@ -1,4 +1,4 @@
 # Format:
 # module:released-version:current-version
 
-google-cloud-logging-logback:0.121.8-alpha:0.121.9-alpha-SNAPSHOT
+google-cloud-logging-logback:0.121.9-alpha:0.121.9-alpha