Backport nginx upgrade to 1.18.0 to 12-10-stable
This is backporting !4242 (merged) to Gitlab 12.10 in response to https://gitlab.com/gitlab-org/omnibus-gitlab/-/issues/5372#note_346874444.
Edited by Takuya Noguchi
This is backporting !4242 (merged) to Gitlab 12.10 in response to https://gitlab.com/gitlab-org/omnibus-gitlab/-/issues/5372#note_346874444.