GEODE-10532: Replace getRawStatusCode() with getStatusCode().value() …

[kaajaln2]

Spring Framework 7 will remove the deprecated method getRawStatusCode() from the ClientHttpResponse interface.
Update the usage of getRawStatusCode() in the Apache Geode project’s HttpRequester.java to use the Spring-recommended method getStatusCode().value() from the same interface.
All unit tests ran successfully.

For all changes, please confirm:

• Is there a JIRA ticket associated with this PR? Is it referenced in the commit message? yes
• Has your PR been rebased against the latest commit within the target branch (typically develop)? yes
• Is your initial contribution a single, squashed commit? yes
• Does gradlew build run cleanly? yes
• Have you written or updated unit tests to verify your changes? existing tests run clean
• If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under ASF 2.0?

[JinwooHwang]

Initiated checks.

[JinwooHwang]

This replaces getRawStatusCode() with response.getStatusCode().value() and updates the 401/403 checks accordingly. Behavior remains the same while avoiding deprecated API usage. Tested and looks good; approving the change.