deps: update dependency org.apache.commons:commons-lang3 to v3.12.0 (#1468)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [org.apache.commons:commons-lang3](https://commons.apache.org/proper/commons-lang/) ([source](https://gitbox.apache.org/repos/asf?p=commons-lang.git)) | `3.8.1` -> `3.12.0` | [![age](https://badges.renovateapi.com/packages/maven/org.apache.commons:commons-lang3/3.12.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/org.apache.commons:commons-lang3/3.12.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/org.apache.commons:commons-lang3/3.12.0/compatibility-slim/3.8.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/org.apache.commons:commons-lang3/3.12.0/confidence-slim/3.8.1)](https://docs.renovatebot.com/merge-confidence/) |

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gax-java/dependencies.properties

@@ -56,7 +56,7 @@ maven.org_apache_tomcat_annotations_api=org.apache.tomcat:annotations-api:6.0.53
 maven.com_google_code_gson_gson=com.google.code.gson:gson:2.10.1
 maven.com_google_guava_guava=com.google.guava:guava:31.1-jre
 maven.com_google_guava_failureaccess=com.google.guava:failureaccess:1.0.1
-maven.org_apache_commons_commons_lang3=org.apache.commons:commons-lang3:3.8.1
+maven.org_apache_commons_commons_lang3=org.apache.commons:commons-lang3:3.12.0
 maven.com_google_android_annotations=com.google.android:annotations:4.1.1.4
 maven.com_google_code_findbugs_jsr305=com.google.code.findbugs:jsr305:3.0.2
 maven.com_google_errorprone_error_prone_annotations=com.google.errorprone:error_prone_annotations:2.18.0