Revert "python3Packages.holidays: 0.85 -> 0.89"

This reverts commit 13716aff67 because it
broke home-assistant.tests.components.holiday.

pkgs/development/python-modules/holidays/default.nix

@@ -8,7 +8,6 @@
   numpy,
   polib,
   pytest-cov-stub,
-  pytest-xdist,
   pytestCheckHook,
   python-dateutil,
   setuptools,
@@ -16,14 +15,14 @@
 
 buildPythonPackage rec {
   pname = "holidays";
-  version = "0.89";
+  version = "0.85";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "vacanza";
     repo = "python-holidays";
     tag = "v${version}";
-    hash = "sha256-g7f0364Xxz+jTjgA8y0nEPbzNalQdMLdwoBZ2odq1W0=";
+    hash = "sha256-ExleK66foB2Q/KK7zcPJ16q4ucz3gOkntB2SQETfHqk=";
   };
 
   build-system = [
@@ -37,10 +36,6 @@ buildPythonPackage rec {
 
   postPatch = ''
     patchShebangs scripts/l10n/*.py
-
-    # generating l10n files imports holidays before distinfo metadata exists
-    substituteInPlace holidays/version.py \
-      --replace-fail 'version("holidays")' '"${version}"'
   '';
 
   preBuild = ''
@@ -56,7 +51,6 @@ buildPythonPackage rec {
     numpy
     polib
     pytest-cov-stub
-    pytest-xdist
     pytestCheckHook
   ];