gst-*: maintenance 1.8.1 -> 1.8.2

For now I left *-vaapi out, as the jump would be larger,
simple update isn't enough, and it's unreferenced in nixpkgs.

pkgs/development/libraries/gstreamer/bad/default.nix

@@ -14,7 +14,7 @@ let
   inherit (stdenv.lib) optional optionalString;
 in
 stdenv.mkDerivation rec {
-  name = "gst-plugins-bad-1.8.1";
+  name = "gst-plugins-bad-1.8.2";
 
   meta = with stdenv.lib; {
     description = "Gstreamer Bad Plugins";
@@ -31,7 +31,7 @@ stdenv.mkDerivation rec {
 
   src = fetchurl {
     url = "${meta.homepage}/src/gst-plugins-bad/${name}.tar.xz";
-    sha256 = "1xa0r98vf0sxw6s90yysvfpzs9yl07xxdci0lv2c0kvkcgrmig8b";
+    sha256 = "d7995317530c8773ec088f94d9320909d41da61996b801ebacce9a56af493f97";
   };
 
   outputs = [ "dev" "out" ];