security/nss: update to 3.76

Changes: https://groups.google.com/a/mozilla.org/g/dev-tech-crypto/c/W13LB93wep4
Changes: https://hg.mozilla.org/projects/nss/shortlog/NSS_3_76_RTM
Reported by: Repology

(cherry picked from commit 932a4a5fb1d16633044a7d38e7a234d212884160)