Fix: Type Error with gmdate() in dashboard Activity widget

[westonruter]

Trac ticket: https://core.trac.wordpress.org/ticket/64496

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[sabernhardt]

This approach silences the error and shows date information, but the date is not reliable with non-integers.

• The numeric string with Simple Location displayed as the next day for two of my posts.
• date_i18n() will give the current date whenever its $timestamp_with_offset parameter is not numeric.

I still think that blank space is better than displaying inaccurate information, but this achieves the main focus of the ticket by preventing a predictable fatal error. PHP 8.4.0 does not complain (yet) about using a false value from get_the_time() in the '%1$s, %2$s' string on line 1036.

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I needed to include results for at least one of the date translation plugins, and WP-Parsidate filters get_the_time well. It returns an integer when the format is 'U', so it does not cause an error in the widget before or after applying either patch. It also returns the Persian time and date strings for displaying in the widget.

(Both the 'Change Locale in admin' and 'Shamsi date' checkboxes should be checked.)