[CI] CI breaks due to Strings.toString() signature change in OpenSearch

[DarshitChanpura]

Security CI is broken due to a change introduced via PR opensearch-project/OpenSearch#6009

This PR introduces a change in method signature for toString() method in commons package: Strings.toString(ToXContent toXContent) to toString(MediaType mediaType, ToXContent toXContent)

Security's toString call : https://github.com/opensearch-project/security/blob/main/src/main/java/org/opensearch/security/configuration/ConfigurationRepository.java#:~:text=Strings,

OpenSearch's toString() implementation: https://github.com/opensearch-project/OpenSearch/blob/ee58457bd5a7313bab201edd38195902f859027c/server/src/main/java/org/opensearch/common/Strings.java#L715

Error details:

[2023-01-26T15:04:47,405][ERROR][o.o.b.OpenSearchUncaughtExceptionHandler] [3c06300b34da.ant.amazon.com] fatal error in thread [opensearch[3c06300b34da.ant.amazon.com][generic][T#5]], exiting
java.lang.NoSuchMethodError: 'java.lang.String org.opensearch.common.Strings.toString(org.opensearch.common.xcontent.ToXContent)'
	at org.opensearch.security.configuration.ConfigurationRepository.getConfigurationsFromIndex(ConfigurationRepository.java:382) ~[?:?]
	at org.opensearch.security.configuration.ConfigurationRepository.getConfigurationsFromIndex(ConfigurationRepository.java:346) ~[?:?]
	at org.opensearch.security.dlic.rest.api.AbstractApiAction.load(AbstractApiAction.java:247) ~[?:?]
	at org.opensearch.security.dlic.rest.api.SecurityConfigAction.handleGet(SecurityConfigAction.java:79) ~[?:?]
	at org.opensearch.security.dlic.rest.api.AbstractApiAction.handleApiRequest(AbstractApiAction.java:124) ~[?:?]
	at org.opensearch.security.dlic.rest.api.PatchableResourceApiAction.handleApiRequest(PatchableResourceApiAction.java:268) ~[?:?]
	at org.opensearch.security.dlic.rest.api.SecurityConfigAction.handleApiRequest(SecurityConfigAction.java:93) ~[?:?]
	at org.opensearch.security.dlic.rest.api.AbstractApiAction.lambda$prepareRequest$2(AbstractApiAction.java:401) ~[?:?]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:577) ~[?:?]
	at java.util.concurrent.FutureTask.run(FutureTask.java:317) ~[?:?]
	at org.opensearch.common.util.concurrent.ThreadContext$ContextPreservingRunnable.run(ThreadContext.java:747) ~[opensearch-3.0.0-SNAPSHOT.jar:3.0.0-SNAPSHOT]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144) ~[?:?]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642) ~[?:?]
	at java.lang.Thread.run(Thread.java:1589) [?:?]
fatal error in thread [opensearch[3c06300b34da.ant.amazon.com][generic][T#5]], exiting

Solution:
Modify toString() to reflect correct signature