Vulnerability: bump `pygments` version to 2.20.0

[apoorvkh]

There's a vulnerability in pygments versions 2.19.2 and prior. Can we bump the minimum version this package depends on to avoid that issue? Thanks.

https://nvd.nist.gov/vuln/detail/CVE-2026-4539

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[apoorvkh]

Presumably this is not a real vulnerability, following Textualize/rich#4044. But I'll let textual maintainers reconsider w.r.t. this project and close the issue if that's the case here too.