Release PyThaiNLP v5.3.x

[wannaphong]

I working with the thesis and researches, so I don't have enough time to develop and release PyThaiNLP v6.0 #1404. I think we should release v5.3.5 and other v5.3.x for fixing bugs and release v6.0 in near the end of 2026.

[wannaphong]

This plan is can change if anything is ok or done.

[wannaphong]

v5.3.5

Process:

• Make v5.3 branch https://github.com/PyThaiNLP/pythainlp/tree/v5.3
• Patch bugfix to v5.3.5
• Release v5.3.5 from v5.3 branch

v5.3.5

• Change loop limit from 20 to dec_maxlen - Change loop limit from 20 to dec_maxlen #1464 (Done f1b633e)
• fix: remove duplicate .replace mid-tone in _clean_ipa - fix: remove duplicate .replace mid-tone in _clean_ipa #1409 (Done 08b2788)
• Fix: CodeQL ReDoS vulnerability in ULMFiT replace_url - Fix: CodeQL ReDoS vulnerability in ULMFiT replace_url #1400 (Done 0eccebb)
• fix: remove unconditional overwrite that disables teacher forcing in Seq2Seq - fix: remove unconditional overwrite that disables teacher forcing in Seq2Seq #1380 (Done e24ccde)

Done https://github.com/PyThaiNLP/pythainlp/releases/tag/v5.3.5