Log Message:
nss: update to 3.76.

Changes:
   - Bug 1755555 - Hold tokensLock through nssToken_GetSlot calls in \ 
nssTrustDomain_GetActiveSlots.
   - Bug 1370866 - Check return value of PK11Slot_GetNSSToken.
   - Bug 1747957 - Use Wycheproof JSON for RSASSA-PSS
   - Bug 1679803 - Add SHA256 fingerprint comments to old certdata.txt entries.
   - Bug 1753505 - Avoid truncating files in nss-release-helper.py.
   - Bug 1751157 - Throw illegal_parameter alert for illegal extensions in \ 
handshake message.