Fix type annotation for __version__ variable

Remove the type hint since it will interfere string matching of tool like bump-my-version

Author: bact

pythainlp/__init__.py

@@ -1,7 +1,7 @@
 # SPDX-FileCopyrightText: 2016-2026 PyThaiNLP Project
 # SPDX-FileType: SOURCE
 # SPDX-License-Identifier: Apache-2.0
-__version__: str = "5.2.0"
+__version__ = "5.2.0"  # type: ignore
 
 thai_consonants: str = (
     "กขฃคฅฆงจฉชซฌญฎฏฐฑฒณดตถทธนบปผฝพฟภมยรลวศษสหฬอฮ"  # 44 chars