fix: remove PHP 8.4 deprecation warning

[tiwarishubham635]

Fixes

1. PHP 8.4 requires nullable parameters to be declared with a ?, so added that change
2. Updating licence year to 2025

Checklist

• I acknowledge that all my contributions will be made under the project's license
• I have made a material change to the repo (functionality, testing, spelling, grammar)
• I have read the Contribution Guidelines and my PR follows them
• I have titled the PR appropriately
• I have updated my branch with the main branch
• I have added tests that prove my fix is effective or that my feature works
• I have added the necessary documentation about the functionality in the appropriate .md file
• I have added inline documentation to the code I modified

If you have questions, please file a support ticket.

[manisha1997]

Suggested change

	* @param string $method the HTTP verb
	* @param string $method The HTTP verb.
	* @param string $url The final URL to call.
	* @param array|null $body The request body.
	* @param array|null $headers Any additional request headers.
	* @param bool $retryOnLimit Should retry if the rate limit is reached?

[theodorejb]

Why add backslashes before the parameter names?

[manisha1997]

changed