Upgrade to Commons Lang3 3.9

Closes gh-16789

Author: snicoll

spring-boot-project/spring-boot-dependencies/pom.xml

@@ -48,7 +48,7 @@
 		<classmate.version>1.5.0</classmate.version>
 		<commons-codec.version>1.12</commons-codec.version>
 		<commons-dbcp2.version>2.6.0</commons-dbcp2.version>
-		<commons-lang3.version>3.8.1</commons-lang3.version>
+		<commons-lang3.version>3.9</commons-lang3.version>
 		<commons-pool.version>1.6</commons-pool.version>
 		<commons-pool2.version>2.6.1</commons-pool2.version>
 		<couchbase-client.version>2.7.4</couchbase-client.version>