chore: new url for remark loader contrib -> main #6094

Job	Run time
Unit Test (ubuntu-latest, lts/*)	35s
E2E test and link check (ubuntu-latest, lts/*)	6m 16s
Proselint (ubuntu-latest, lts/*)	46s
Lint (ubuntu-latest, lts/*)	47s
	8m 24s

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