Update pygments requirement from >=2.15.1 to >=2.21.0 - #26

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cellforge/Code_Generation/codex_backend.py:106:24: UP006 Use `dict` instead of `Dict` for type annotation help: Replace with `dict`

cellforge/Code_Generation/codex_backend.py:73:80: UP006 Use `list` instead of `List` for type annotation help: Replace with `list`

cellforge/Code_Generation/codex_backend.py:73:74: UP006 Use `tuple` instead of `Tuple` for type annotation help: Replace with `tuple`

cellforge/Code_Generation/codex_backend.py:7:1: UP035 `typing.Tuple` is deprecated, use `tuple` instead

cellforge/Code_Generation/codex_backend.py:7:1: UP035 `typing.List` is deprecated, use `list` instead

cellforge/Code_Generation/codex_backend.py:7:1: UP035 `typing.Dict` is deprecated, use `dict` instead

cellforge/Code_Generation/base.py:29:85: UP006 Use `dict` instead of `Dict` for type annotation help: Replace with `dict`

cellforge/Code_Generation/base.py:29:42: UP006 Use `dict` instead of `Dict` for type annotation help: Replace with `dict`

cellforge/Code_Generation/base.py:23:24: UP006 Use `dict` instead of `Dict` for type annotation help: Replace with `dict`

cellforge/Code_Generation/base.py:5:1: UP035 `typing.Dict` is deprecated, use `dict` instead

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/setup-python@v5. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/