ltex-ls: migrate to [email protected]

[daeho-ro]

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[Copilot]

Pull Request Overview

This PR migrates the ltex-ls formula from Python 3.13 to Python 3.14 and pins the OpenJDK dependency to version 21 due to compatibility issues with newer versions (25+).

Key changes:

• Updated Python dependency from [email protected] to [email protected]
• Changed OpenJDK dependency from generic openjdk to pinned openjdk@21 with a comment explaining the version limitation
• Updated all references to use the new Python and Java versions throughout the installation process

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[github-actions]

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