fix: Cart_Mutation:prepare_attributes made public #944

Job	Run time
Running Automated Tests w/ WPBrowser in WordPress v6.3 on PHP8.1	4m 52s
Running Automated Tests w/ WPBrowser in WordPress v6.2 on PHP8.1 with HPOS activated	3m 27s
Running Automated Tests w/ WPBrowser in WordPress v6.1 on PHP8.1 in Debug Mode	3m 27s
Running Automated Tests w/ WPBrowser in WordPress v6.0 on PHP8.1	4m 23s
Running Automated Tests w/ WPBrowser in WordPress v6.3 on PHP8.0	3m 13s
Running Automated Tests w/ WPBrowser in WordPress v6.2 on PHP8.0 with HPOS activated	4m 42s
Running Automated Tests w/ WPBrowser in WordPress v6.1 on PHP8.0	3m 18s
Running Automated Tests w/ WPBrowser in WordPress v6.0 on PHP8.0	4m 19s
Running Automated Tests w/ WPBrowser in WordPress v6.3 on PHP7.4	6m 3s
Running Automated Tests w/ WPBrowser in WordPress v6.2 on PHP7.4 with HPOS activated with Codecoverage	17m 55s
Running Automated Tests w/ WPBrowser in WordPress v6.1 on PHP7.4	8m 7s
Running Automated Tests w/ WPBrowser in WordPress v6.0 on PHP7.4	5m 55s
	1h 9m 41s

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