fix(deps): add Pygments to requirements.txt (rich.syntax dep)

[iav]

lib/tools/patching.py:444 imports from rich.syntax import Syntax. The rich package pinned in requirements.txt has pygments<3.0.0,>=2.13.0 listed in its PyPI requires_dist, yet on a fresh host the install resolved to rich without pulling Pygments (possibly an interaction with the pinned pip == 26.1.1 resolver or a cached pip-hash short-circuit). The build fails with:

Traceback (most recent call last):
  File "/armbian/lib/tools/patching.py", line 444, in <module>
    from rich.syntax import Syntax
  File ".../rich/syntax.py", line 24, in <module>
    from pygments.lexer import Lexer
ModuleNotFoundError: No module named 'pygments'

Reproduced on a fresh Hetzner CAX21 (Ubuntu Noble 6.8) with:

./compile.sh build BOARD=helios4 BRANCH=edge BUILD_MINIMAL=yes \
  RELEASE=noble PREFER_DOCKER=yes KERNEL_CONFIGURE=no EXPERT=yes \
  ARTIFACT_IGNORE_CACHE=yes

Fail surface is the u-boot patching phase (uboot_main_patching_python); any code path that imports rich.syntax is affected.

Pinning Pygments == 2.19.1 explicitly in requirements.txt is a defensive fix — dependabot will keep it current alongside rich.

Assisted-by: Claude:claude-opus-4.7

Summary by CodeRabbit

• Chores
  • Updated syntax highlighting dependency to a pinned version.

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• requirements.txt

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📝 Walkthrough

Walkthrough

This PR adds a single pinned dependency on Pygments version 2.19.1 to requirements.txt, explicitly marking it as required by the rich.syntax module for syntax highlighting functionality.

Changes

Dependencies

Layer / File(s)	Summary
Pygments dependency requirements.txt	Pygments == 2.19.1 is pinned and added to requirements with a clarifying comment that it is required by rich.syntax.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A library so bright, for colors so fine,
Pygments joins the fold, locked to 2.19!
Rich syntax now shines with its proper delight,
One line in requirements makes everything right! ✨

🚥 Pre-merge checks | ✅ 5

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Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely summarizes the main change: adding Pygments as an explicit dependency to requirements.txt to fix a missing dependency issue with rich.syntax.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
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✅ This PR has been reviewed and approved — all set for merge!