Fix compatibility with ruby-head

[anakinj]

Description

The spec against ruby-head is failing currently. Seems like it's not allowed to call .new without params anymore.

Should not cause trouble with production setups as we check for openssl before looking at the RSA capabilities.

Checklist

Before the PR can be merged be sure the following are checked:

• There are tests for the fix or feature added/changed
• A description of the changes and a reference to the PR has been added to CHANGELOG.md. More details in the CONTRIBUTING.md

[Copilot]

Pull Request Overview

This PR fixes compatibility with ruby-head where OpenSSL::PKey::RSA.new can no longer be called without parameters. The changes replace instance-based method checks with class-level method checks.

• Replaced .new.respond_to?(:method_name) with .method_defined?(:method_name) to check for method existence without instantiation
• Updated version to 3.1.3 and added changelog entry

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
spec/jwt/jwk/rsa_spec.rb	Updated test skip conditions to use method_defined? instead of instantiating RSA objects
lib/jwt/jwk/rsa.rb	Updated production code alias condition to check method existence without instantiation
lib/jwt/version.rb	Bumped TINY version from 2 to 3 for patch release
CHANGELOG.md	Added v3.1.3 changelog entry documenting the fix

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