Feat: Update pygments to version 2.20.0 to avoid denial-of-service attack (CVE-2026-4539)

[SmartLamScott]

What's the problem this feature will solve?

Avoid a regular expression denial-of-service vulnerability with pygments<2.20.0.

Describe the solution you'd like

Upgrade pygments requirement to pygments>=2.20.0.

Alternative Solutions

N/A

Additional context

Please consult the original GitHub issue on pygments for more information.

[bluetech]

Closing as discussed in the PR.