Synchronise `links.opam` #1268

Job	Run time
links-mysql_mysql57 (ubuntu-20.04, 5.1.1)	5m 27s
interpreter (ubuntu-20.04, 5.1.1)	4m 52s
js-runtime-lint (ubuntu-latest)	8s
build-doc (ubuntu-20.04)	15s
postgres-mysql-sqlite3 (ubuntu-20.04, 5.1.1)	5m 44s
rule-check (ubuntu-20.04, 5.1.1)	3m 54s
	20m 20s

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