fix: Fix Python 3.8 support

pysubs2/microdvd.py

@@ -1,6 +1,6 @@
 from functools import partial
 import re
-from typing import Optional, TextIO, Any, TYPE_CHECKING
+from typing import Optional, TextIO, Any, Match, TYPE_CHECKING
 
 from .exceptions import UnknownFPSError
 from .ssaevent import SSAEvent
@@ -71,7 +71,7 @@ def from_file(cls, subs: "SSAFile", fp: TextIO, format_: str, fps: Optional[floa
             def prepare_text(text: str) -> str:
                 text = text.replace("|", r"\N")
 
-                def style_replacer(match: re.Match[str]) -> str:
+                def style_replacer(match: Match[str]) -> str:
                     tags = [c for c in "biu" if c in match.group(0)]
                     return "{%s}" % "".join(f"\\{c}1" for c in tags)
 

pysubs2/ssafile.py

@@ -1,10 +1,9 @@
-from collections.abc import MutableSequence
 import io
 from io import open
 from itertools import chain
 import os.path
 import logging
-from typing import Optional, List, Dict, Iterable, Any, overload, Iterator, TextIO, Tuple
+from typing import Optional, List, Dict, Iterable, Any, overload, Iterator, TextIO, Tuple, MutableSequence
 
 from .common import IntOrFloat
 from .formats import autodetect_format, get_format_class, get_format_identifier