[guix] Update channels.

scripts/guix/channels.scm

@@ -2,13 +2,13 @@
         (name 'guix-ogs)
         (url "https://gitlab.opengeosys.org/ogs/inf/guix-ogs.git")
         (branch "master")
-        (commit "151fe23f8610b85a84dbaf6888a5afc1256cbb10"))
+        (commit "49ad517d788eff70640a22920f4ca0ccbfeffb23"))
       (channel
         (name 'guix)
         (url "https://git.savannah.gnu.org/git/guix.git")
         (branch "master")
         (commit
-          "6cb181c07f83dfdeae1882208941086f3717a165")
+          "51de844a0ff6ea224367a384092896bce6848b9f")
         (introduction
           (make-channel-introduction
             "cdf1d7dded027019f0ebbd5d6f0147b13dfdd28d"