package/libnss: security bump to version 3.46

package/libnss: security bump to version 3.46

Fixes the following security issues:

(3.44.1)
CVE-2019-11729: More thorough input checking
CVE-2019-11719: Don't unnecessarily strip leading 0's from key material
during PKCS11 import
CVE-2019-11727: Prohibit use of RSASSA-PKCS1-v1_5 algorithms in TLS 1.3

Note:
This version requires nspr 4.22 or newer provided by the previous patch.

Signed-off-by: Giulio Benetti <giulio.benetti@micronovasrl.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>