Update apimatic/unirest-php package to 4.0.7.

[peterwilsoncc]

All Submissions:

• Does your code follow the WooCommerce Sniffs variant of WordPress coding standards?
• Have you written new tests for your changes, as applicable?
• Have you successfully run tests with your changes locally?
• Will this change require new documentation or changes to existing documentation?

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Changes proposed in this Pull Request:

Updates the apimatic/unirest-php package to 4.0.7 to include the fix for apimatic/unirest-php#59

Upstream changes included in this update:

• fix(post-request): handle empty body apimatic/unirest-php#61
• fix(curl): handle non-string response from curl_exec apimatic/unirest-php#60 (the fix for the issue in WC Sq)
• feat(php-unirest): added proxy server configuration apimatic/unirest-php#56

This is to resolve a fatal error that can occur after a server migration.

Closes https://linear.app/a8c/issue/SQUARE-109/possible-one-off-fatal-error-crashes-wp-admin-after-server-migration

Steps to test the changes in this Pull Request:

As this updates a package used by the Square SDK all critical flows should be tested.

Changelog entry

Fix - Resolve fatal errors that may occur after a server migration.
Dev - Update apimatic/unirest-php package to 4.0.7.

[dkotter]

@peterwilsoncc Is this one ready for review?

[peterwilsoncc]

@dkotter Yep, now that #426 has been merged with the E2E fixes I'm happy for this to start the process. Sorry this slipped while working on the CVE.