xlsxgrep: drop

Remove xlsxgrep The last update from 0.0.23 to 0.0.29 broke it as it switched from xlrd to pyexcel.

I tried switching to pyexcel but pyexcel-xlsx (for .xlsx support - important) isn't packaged yet.
I tried packaging it but pyexcel-xlsx doesn't seem to be actively maintained anymore and
isn't compatible with the most recent openpyxl version.

I also considered downgrading to 0.0.23 but xlrd is unmaintained and recommends openpyxl.

pkgs/top-level/aliases.nix

@@ -1298,6 +1298,7 @@ mapAliases {
   xenPackages = throw "The attributes in the xenPackages set have been promoted to the top-level. (xenPackages.xen_4_19 -> xen)";
   xineLib = throw "'xineLib' has been renamed to/replaced by 'xine-lib'"; # Converted to throw 2024-10-17
   xineUI = throw "'xineUI' has been renamed to/replaced by 'xine-ui'"; # Converted to throw 2024-10-17
+  xlsxgrep = throw "'xlsxgrep' has been dropped due to lack of maintenance."; # Added 2024-11-01
   xmlada = gnatPackages.xmlada; # Added 2024-02-25
   xmr-stak = throw "xmr-stak has been removed from nixpkgs because it was broken"; # Added 2024-07-15
   xmake-core-sv = throw "'xmake-core-sv' has been removed, use 'libsv' instead"; # Added 2024-10-10