Synchronise `links.opam` #1269

Job	Run time
js-runtime-lint (ubuntu-latest)	11s
interpreter (ubuntu-20.04, 5.1.1)	4m 55s
links-mysql_mysql57 (ubuntu-20.04, 5.1.1)	5m 34s
build-doc (ubuntu-20.04)	14s
postgres-mysql-sqlite3 (ubuntu-20.04, 5.1.1)	5m 48s
rule-check (ubuntu-20.04, 5.1.1)	3m 42s
	20m 24s

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