fix: bump youtube-transcript-api to >=1.2.3 for Python 3.14 support

[Nithin Jambula (nithin434)]

Fix: Bump youtube-transcript-api for Python 3.14 support

This PR resolves the installation error reported in Issue #2287.

Issue

On Python 3.14.6, installing with pip install -e 'packages/markitdown[all]' fails with:

INFO: pip is looking at multiple versions of markitdown[all] to determine which version is compatible with other requirements. This could take a while.
ERROR: Ignored the following versions that require a different python version: 0.5.0 Requires-Python >=3.8,<3.12; 0.5.1 Requires-Python >=3.8,<3.13; 0.6.3 Requires-Python <3.14,>=3.8; 1.0.0 Requires-Python <3.14,>=3.8; 1.0.1 Requires-Python <3.14,>=3.8; 1.0.2 Requires-Python <3.14,>=3.8; 1.0
[tests.md](https://github.com/user-attachments/files/31925193/tests.md)
.3 Requires-Python <3.14,>=3.8; 1.1.0 Requires-Python <3.14,>=3.8; 1.1.1 Requires-Python <3.14,>=3.8; 1.2.0 Requires-Python <3.14,>=3.8; 1.2.1 Requires-Python <3.14,>=3.8; 1.2.2 Requires-Python <3.14,>=3.8
ERROR: Could not find a version that satisfies the requirement youtube-transcript-api~=1.0.0; extra == "all" (from markitdown[all]) (from versions: 0.1.0, 0.1.1, 0.1.2, 0.1.3, 0.1.4, 0.1.5, 0.1.6, 0.1.7, 0.1.8, 0.1.9, 0.2.0, 0.2.1, 0.3.0, 0.3.1, 0.4.0, 0.4.1, 0.4.2, 0.4.3, 0.4.4, 0.5.0, 0.6.0, 0.6.1, 0.6.2, 1.2.3, 1.2.4)
ERROR: No matching distribution found for youtube-transcript-api~=1.0.0; extra == "all"

Root Cause

The dependency youtube-transcript-api~=1.0.0 restricts to versions <1.1.0, all of which require Python <3.14. This blocks Python 3.14+ users from installing the [all] extra.

Fix

• Bump the dependency constraint from youtube-transcript-api~=1.0.0 to youtube-transcript-api>=1.2.3
• Version 1.2.3+ supports Python 3.14+ (Requires-Python <3.15)
• No code changes are needed as the 1.x API remains compatible

Testing

• ✅ Successfully installed and tested on Python 3.14.6
• ✅ Installation now completes without errors

Closes #2287

[Nithin Jambula (nithin434)]

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