opencpn: 4.8.2 -> 4.8.4

Semi-automatic update generated by https://github.com/ryantm/nixpkgs-update tools.

This update was made based on information from https://repology.org/metapackage/opencpn/versions.

These checks were done:

- built on NixOS
- Warning: no binary found that responded to help or version flags. (This warning appears even if the package isn't expected to have binaries.)
- found 4.8.4 with grep in /nix/store/jlmxcb41bg1v2blsl2vgbjszaafkcvgv-opencpn-4.8.4
- directory tree listing: https://gist.github.com/8becdf1d24e33d05a2f0afdac7c9d764

pkgs/applications/misc/opencpn/default.nix

@@ -3,13 +3,13 @@
 
 stdenv.mkDerivation rec {
   name = "opencpn-${version}";
-  version = "4.8.2";
+  version = "4.8.4";
 
   src = fetchFromGitHub {
     owner = "OpenCPN";
     repo = "OpenCPN";
     rev = "v${version}";
-    sha256 = "0r6a279xhhf4jrmjb2xi5arxb4xd5wvqbs4hyyildlgpr1x7bd09";
+    sha256 = "0v4klprzddmpq7w8h2pm69sgbshirdmjrlzhz62b606gbr58fazf";
   };
 
   nativeBuildInputs = [ pkgconfig ];