build(deps): bump commons-codec:commons-codec from 1.20.0 to 1.21.0 (GoogleCloudPlatform#4117)

Bumps [commons-codec:commons-codec](https://github.com/apache/commons-codec) from 1.20.0 to 1.21.0.
- [Changelog](https://github.com/apache/commons-codec/blob/master/RELEASE-NOTES.txt)
- [Commits](apache/commons-codec@rel/commons-codec-1.20.0...rel/commons-codec-1.21.0)

---
updated-dependencies:
- dependency-name: commons-codec:commons-codec
  dependency-version: 1.21.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]

pom.xml

@@ -196,7 +196,7 @@
     <dependency>
       <groupId>commons-codec</groupId>
       <artifactId>commons-codec</artifactId>
-      <version>1.20.0</version>
+      <version>1.21.0</version>
     </dependency>
     <dependency>
       <groupId>org.apache.commons</groupId>