Update jdenticon to version 2.0.0

[chihsuan]

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Changes proposed in this Pull Request:

When I ran the generate product command, I got the deprecation warning below.

This PR updates the jdenticon to the latest version, which is compatible with PHP 8.4, to fix the issue. Note it doesn't support PHP <= 7.3 anymore; however, woocommerce already dropped support for PHP <= 7.3, so it should be fine.

See https://github.com/dmester/jdenticon-php/releases for more details.

How to test the changes in this Pull Request:

1. In a WooCommerce site with PHP 8.2 or higher
2. Run wp wc generate products 10
3. Confirm that there is no deprecation warning

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully run tests with your changes locally?

Changelog entry

Update jdenticon to version 2.0.0 to fix deprecation warnings

FOR PR REVIEWER ONLY:

• I have reviewed that everything is sanitized/escaped appropriately for any SQL or XSS injection possibilities. I made sure Linting is not ignored or disabled.

[layoutd]

👍🏻 LGTM thanks for the fix @chihsuan. Had some trouble reproducing the issue, if the store has any pre-existing media items it looks like the deprecation message doesn't appear (i.e., if you prime the test site the the sample WooCommerce data, then there's no message).