Updated to latest version and removed GNOME dep

GZDoom got updated yesterday to version 4.2.1. GNOME dep was originally added for an included launcher, but that is no longer required.

org.zdoom.GZDoom.yaml

@@ -1,7 +1,7 @@
 app-id: org.zdoom.GZDoom
-runtime: org.gnome.Platform
-sdk: org.gnome.Sdk
-runtime-version: "3.32"
+runtime: org.freedesktop.Platform
+sdk: org.freedesktop.Sdk
+runtime-version: "18.08"
 command: gzdoom.sh
 
 finish-args:
@@ -62,15 +62,14 @@ modules:
   buildsystem: cmake-ninja
   config-opts:
   - -DCMAKE_BUILD_TYPE=RelWithDebInfo
-  - -DSEND_ANON_STATS=OFF
   # Required when targeting 32-bit x86
   - -DCMAKE_CXX_FLAGS="-msse3"
   sources:
   - type: archive
-    url: https://github.com/coelckers/gzdoom/archive/g4.2.0.tar.gz
-    sha256: 9d781e868f32ad53aa262691f76cab09b12661ababd2b7f5735fe852ab74d566
+    url: https://github.com/coelckers/gzdoom/archive/g4.2.1.tar.gz
+    sha256: de014b0d3e1c702dbba16acadc596158bb8185c268ed4afa605d625d35f37a62
   - type: file
-    url: https://github.com/coelckers/gzdoom/raw/g4.2.0/soundfont/gzdoom.sf2
+    url: https://github.com/coelckers/gzdoom/raw/g4.2.1/soundfont/gzdoom.sf2
     sha256: fca3e514b635a21789d4224e84865d2954a2a914d46b64aa8219ddb565c44869
   - type: shell
     commands: