SpringBoot Adapt deprecated getIpAddress call with getHost in Redis Tests

A deprecated method call for getIpAddress() is replaced in this commit with a new method getHost().

This closes #32130

Comment From: thegeekyasian

@philwebb can you please review this small PR, replacing the deprecated method call to avoid buildSrc failures for deprecated checks.

Comment From: snicoll

Thanks for the PR, this is related to #32127

Comment From: snicoll

@thegeekyasian thank you for making your first contribution to Spring Boot.