Migrate from Commons Lang 2 to Commons Lang 3 (#378)

Co-authored-by: Tim Jacomb <timjacomb1@gmail.com>

Author: timja-bot

pom.xml

@@ -20,6 +20,7 @@
     <jenkins.version>${jenkins.baseline}.3</jenkins.version>
     <hpi.compatibleSinceVersion>2.0</hpi.compatibleSinceVersion>
     <ban-junit4-imports.skip>false</ban-junit4-imports.skip>
+    <ban-commons-lang-2.skip>false</ban-commons-lang-2.skip>
   </properties>
 
   <name>Azure Key Vault Plugin</name>

src/main/java/org/jenkinsci/plugins/azurekeyvaultplugin/credentials/sshuserprivatekey/AzureSSHUserPrivateKeyCredentials.java

@@ -13,7 +13,7 @@
 import java.util.List;
 import java.util.function.Supplier;
 import java.util.stream.Collectors;
-import org.apache.commons.lang.StringUtils;
+import org.apache.commons.lang3.StringUtils;
 import org.jenkinsci.plugins.azurekeyvaultplugin.AzureCredentialsProvider;
 import org.jvnet.localizer.ResourceBundleHolder;