Synchronise `links.opam` #1245

Job	Run time
interpreter (ubuntu-20.04, 5.1.1)	8m 35s
postgres-mysql-sqlite3 (ubuntu-20.04, 5.1.1)	7m 26s
rule-check (ubuntu-20.04, 5.1.1)	3m 56s
build-doc (ubuntu-20.04)	13s
js-runtime-lint (ubuntu-latest)	8s
links-mysql_mysql57 (ubuntu-20.04, 5.1.1)	6m 2s
	26m 20s

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