extremetuxracer: 0.7.4 -> 0.7.5

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

This update was made based on information from https://repology.org/metapackage/extremetuxracer/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 0.7.5 with grep in /nix/store/aqs72fzhj8mlf9dlcrh0nsmwczsxa0il-extremetuxracer-0.7.5
- directory tree listing: https://gist.github.com/af25592b4861fd5c1e67e48c17da69d9

pkgs/games/extremetuxracer/default.nix

@@ -5,12 +5,12 @@
 }:
 
 stdenv.mkDerivation rec {
-  version = "0.7.4";
+  version = "0.7.5";
   name = "extremetuxracer-${version}";
 
   src = fetchurl {
     url = "mirror://sourceforge/extremetuxracer/etr-${version}.tar.xz";
-    sha256 = "0d2j4ybdjmimg67v2fndgahgq4fvgz3fpfb3a4l1ar75n6hy776s";
+    sha256 = "1ly63316c07i0gyqqmyzsyvygsvygn0fpk3bnbg25fi6li99rlsg";
   };
 
   buildInputs = [