Upgrades to support af-south-1 region

[dev-rowbot]

• Gradle 5.1.1
• AWS SDK Version 1.12.262 to support af-south-1

I tried to use Rundeck in Kubernetes and write to a bucket in the af-south-1 region but hit this error:

[2022-07-18T12:36:57,020] ERROR services.LogFileStorageService - Failed to initialize LogFileStoragePlugin 'org.rundeck.amazon-s3': java.lang.IllegalArgumentException: Region was not found: af-south-1
java.lang.IllegalArgumentException: Region was not found: af-south-1
	at org.rundeck.plugins.S3LogFileStoragePlugin.initialize(S3LogFileStoragePlugin.java:159) ~[?:?]
	at com.dtolabs.rundeck.plugins.logging.ExecutionFileStoragePlugin$initialize.call(Unknown Source) ~[?:?]
	at rundeck.services.LogFileStorageService.getConfiguredPlugin(LogFileStorageService.groovy:1424) ~[classes!/:?]