Only import deque in type checking mode to fix 3.5 runtime support

mautrix_telegram/formatter/from_matrix/parser_htmlparser.py

@@ -14,7 +14,7 @@
 #
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
-from typing import (Optional, List, Tuple, Type, Dict, Any, Deque, Match)
+from typing import (Optional, List, Tuple, Type, Dict, Any, TYPE_CHECKING, Match)
 from html import unescape
 from html.parser import HTMLParser
 from collections import deque
@@ -29,6 +29,9 @@ from ... import user as u, puppet as pu, portal as po
 from ..util import html_to_unicode
 from .parser_common import MatrixParserCommon, ParsedMessage
 
+if TYPE_CHECKING:
+    from typing import Deque
+
 
 def parse_html(html: str) -> ParsedMessage:
     parser = MatrixParser()