package/libnss: bump version to 3.55

package/libnss: bump version to 3.55

Bump version to 3.55. Unfortunately local patch is still pending
upstream and not applied and I've just asked why:
https://bugzilla.mozilla.org/show_bug.cgi?id=1642174

This version requires NSPR 4.27.

Release Notes:
https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.55_release_notes

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
[yann.morin.1998@free.fr: two spaces in hash file]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>