mkgmap: 4922 -> 4923 (#372693)

pkgs/applications/misc/mkgmap/default.nix

···
 in
 stdenv.mkDerivation rec {
   pname = "mkgmap";
-  version = "4922";
+  version = "4923";
 
   src = fetchsvn {
     url = "https://svn.mkgmap.org.uk/mkgmap/mkgmap/trunk";
     rev = version;
-    sha256 = "sha256-LgGdV6l9tjRR4BpGTDTm0MeAq2uiOe7Pv0qv87nbbWw=";
+    sha256 = "sha256-tB/0VFLn/ch7XWPz1sJ3kqy/1U5Hk1yV9+wq7ohTRWw=";
   };
 
   patches = [