gcc: 11.2.0 -> 11.3.0

Bug fix release.

Changes: https://gcc.gnu.org/gcc-11/changes.html (11.3 link below).

pkgs/development/compilers/gcc/11/default.nix

@@ -52,7 +52,7 @@ with lib;
 with builtins;
 
 let majorVersion = "11";
-    version = "${majorVersion}.2.0";
+    version = "${majorVersion}.3.0";
 
     inherit (stdenv) buildPlatform hostPlatform targetPlatform;
 
@@ -91,7 +91,7 @@ stdenv.mkDerivation ({
 
   src = fetchurl {
     url = "mirror://gcc/releases/gcc-${version}/gcc-${version}.tar.xz";
-    sha256 = "sha256-0I7cU2tUw3KhAQ/2YZ3SdMDxYDqkkhK6IPeqLNo2+os=";
+    sha256 = "sha256-tHzygYaR9bHiHfK7OMeV+sLPvWQO3i0KXhyJ4zijrDk=";
   };
 
   inherit patches;