security/nss: update to 3.69
Changes: https://developer.mozilla.org/docs/Mozilla/Projects/NSS/NSS_3.69_release_notes
Changes: https://hg.mozilla.org/projects/nss/shortlog/NSS_3_69_RTM
(cherry picked from commit 1684f47e9bea7c1d47924756d545871276bb0581)