Update Spring to 6.2

[yuppie-flu]

Description

This PR updates Spring Framework version to 6.2.1 and replaces removed (deprecated) APIs to alternatives:

• removed AbstractClientHttpResponse abstract class was replaced to ClientHttpResponse interface

In Spring Framework 6.2 org.springframework.http.HttpRequest interface received a new method: Map<String, Object> getAttributes() without a default implementation. The PR doesn't implement the method and throw UnsupportedOperationException instead. It seems that this method is needed only for very rare use cases (like passing attributes to interceptors, see spring-projects/spring-framework#32027). However, we can discuss if some implementation in Riptide makes sense.

Motivation and Context

In Spring Framework 6.2 release several deprecated APIs were removed. The current Riptide code uses some of them, in particular: org.springframework.http.client.AbstractClientHttpResponse.
The newest Spring Boot 3.4 release uses Spring Framework 6.2. The incompatibility of the current Riptide with Spring Framework 6.2 makes it impossible to upgrade services that use Riptide to the latest Spring Boot. ClassNotFoundException about AbstractClientHttpResponse is thrown at runtime.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [?] My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.

[fatroom]

👍

[yuppie-flu]

👍