Fix: prevent curl_close() deprecation on PHP 8.5

[robinson-j16]

What is the reason for this PR?

• A new feature
• Fixed an issue (resolve curl close deprecated as of PHP 8.5 #1040)

Author's checklist

• Follow the Contribution Guide
• New features and changes are documented

Summary of changes

This PR addresses the curl_close() deprecation introduced in PHP 8.5. Since PHP 8.0, cURL handles are automatically managed objects, making explicit calls to curl_close() a no-op. Starting with PHP 8.5, calling this function triggers an E_DEPRECATED notice.

Changes included:

• Wrapped curl_close() calls in src/Faker/Provider/Image.php with a PHP_VERSION_ID < 80000 check.
• Updated the corresponding test in test/Faker/Provider/ImageTest.php to prevent deprecation warnings during test execution.
• Verified that the fix maintains compatibility with PHP 7.4 through PHP 8.5.

Review checklist

• All checks have passed
• Changes are added to the CHANGELOG.md
• Changes are approved by maintainer