treewide: remove ThomasMader as maintainer from Dlang packages (#291338)

pkgs/development/compilers/dmd/generic.nix

···
     # Everything is now Boost licensed, even the backend.
     # https://github.com/dlang/dmd/pull/6680
     license = licenses.boost;
-    maintainers = with maintainers; [ ThomasMader lionello dukc jtbx ];
+    maintainers = with maintainers; [ lionello dukc jtbx ];
     platforms = [ "x86_64-linux" "i686-linux" "x86_64-darwin" ];
   };
 }

pkgs/development/compilers/ldc/binary.nix

···
     homepage = "https://github.com/ldc-developers/ldc";
     # from https://github.com/ldc-developers/ldc/blob/master/LICENSE
     license = with licenses; [ bsd3 boost mit ncsa gpl2Plus ];
-    maintainers = with maintainers; [ ThomasMader lionello ];
+    maintainers = with maintainers; [ lionello ];
     platforms = [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin" ];
   };
 }

pkgs/development/compilers/ldc/generic.nix

···
     homepage = "https://github.com/ldc-developers/ldc";
     # from https://github.com/ldc-developers/ldc/blob/master/LICENSE
     license = with licenses; [ bsd3 boost mit ncsa gpl2Plus ];
-    maintainers = with maintainers; [ ThomasMader lionello jtbx ];
+    maintainers = with maintainers; [ lionello jtbx ];
     platforms = [ "x86_64-linux" "i686-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
   };
 }

pkgs/development/tools/build-managers/dub/default.nix

···
     description = "Package and build manager for D applications and libraries";
     homepage = "https://code.dlang.org/";
     license = licenses.mit;
-    maintainers = with maintainers; [ ThomasMader jtbx ];
+    maintainers = with maintainers; [ jtbx ];
     platforms = [ "x86_64-linux" "i686-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
   };
 }

pkgs/development/tools/dtools/default.nix

···
     description = "Ancillary tools for the D programming language compiler";
     homepage = "https://github.com/dlang/tools";
     license = lib.licenses.boost;
-    maintainers = with maintainers; [ ThomasMader jtbx ];
+    maintainers = with maintainers; [ jtbx ];
     platforms = lib.platforms.unix;
   };
 }