replace inlinestyler with css_inline to fix CSSSelector error

pyproject.toml

@@ -45,7 +45,7 @@ dependencies = [
         'celery==5.2.*',
         'kombu==5.2.*',
         'django-statici18n==2.3.*',
-        'inlinestyler==0.2.*',
+        'css-inline==0.7.*',
         'BeautifulSoup4==4.12.*',
         'slimit',
         'lxml',

src/pretix/base/email.py

@@ -12,7 +12,7 @@
 from django.template.loader import get_template
 from django.utils.timezone import now
 from django.utils.translation import get_language, gettext_lazy as _
-from inlinestyler.utils import inline_css
+from css_inline import inline as inline_css
 
 from pretix.base.i18n import (
     LazyCurrencyNumber, LazyDate, LazyExpiresDate, LazyNumber,

src/pretix/base/services/mail.py

@@ -10,7 +10,6 @@
 from typing import Any, Dict, List, Sequence, Union
 from urllib.parse import urljoin, urlparse
 
-import cssutils
 import pytz
 import requests
 from bs4 import BeautifulSoup
@@ -43,7 +42,6 @@
 
 logger = logging.getLogger('pretix.base.mail')
 INVALID_ADDRESS = 'invalid-pretix-mail-address'
-cssutils.log.setLevel(logging.CRITICAL)
 
 
 class TolerantDict(dict):

src/pretix/base/services/notifications.py

@@ -2,7 +2,7 @@
 from django.template.loader import get_template
 from django.utils.timezone import override
 from django_scopes import scope, scopes_disabled
-from inlinestyler.utils import inline_css
+from css_inline import inline as inline_css
 
 from pretix.base.i18n import language
 from pretix.base.models import LogEntry, NotificationSetting, User