Bump pymdown-extensions from 10.16.1 to 10.21.3
Bump pymdown-extensions from 10.16.1 to 10.21.3: a task in repo2rlenv-v083-pr diff (Harbor dataset). Title: Bump pymdown-extensions from 10.16.1 to 10.21.3
The task
**Title:** Bump pymdown-extensions from 10.16.1 to 10.21.3
Part of AdithyaSK/repo2rlenv-v083-pr_diff.