Bumps u2mfn version 4.0.30 -> 4.0.31

Tracking upstream changes so that clean installs continue to work.

Author: Conor Schaefer

securedrop-workstation-grsec/debian/changelog-buster

@@ -1,3 +1,9 @@
+securedrop-workstation-grsec (4.14.186+buster3) unstable; urgency=medium
+
+  * Bumps u2mfn version 4.0.30 -> 4.0.31
+
+ -- SecureDrop Team <securedrop@freedom.press>  Tue, 17 Nov 2020 15:57:41 -0800
+
 securedrop-workstation-grsec (4.14.186+buster2) unstable; urgency=medium
 
   * Ensures u2mfn module is built via dkms, otherwise fails

securedrop-workstation-grsec/debian/postinst

@@ -21,7 +21,7 @@ set -e
 # When updating the kernel version, also check that the u2mfn version matches:
 # https://github.com/QubesOS/qubes-linux-utils/blob/release4.0/version
 GRSEC_VERSION='4.14.186-grsec-workstation'
-U2MFN_VERSION="4.0.30"
+U2MFN_VERSION="4.0.31"
 
 # Sets default grub boot parameter to the kernel version specified
 # by $GRSEC_VERSION. The debian buster default kernel is 4.19, thus