Add `--update-attachment-refs` flag to `wp media regenerate` #329

Job	Run time
code-quality / Lint Gherkin Feature files	12s
code-quality / Spell check	7s
code-quality / Lint PHP files	17s
code-quality / Lint GitHub Actions workflows	7s
code-quality / PHPStan	23s
code-quality / PHPCS	21s
	1m 27s

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