chore: fix php 8.5 deprecation warning

[slipszenko]

Fixes

Call unset() instead of curl_close() to prevent PHP 8.5 deprecation errors.

Checklist

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• 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
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[esetnik]

@manisha1997 I see that you were previously maintainer of this project. Can you please take a look at this? This unsupported deprecation is causing thousands of warnings per hour in our application. Thanks.

[Yarre]

Just bumping things up, can it be merged? It is really annoying with deprecation warning.

[Yarre]

Thank you. I think the build should be rerun or so as the test was fixed separately/