chore(deps): update urllib3 (#153)

<!-- This is an auto-generated description by cubic. -->
## Summary by cubic
Upgraded urllib3 from 2.5.0 to 2.6.2 in poetry.lock to keep dependencies
current and improve compatibility.

Updates include: brotli extra version bump and zstd extra now using
backports-zstd for Python < 3.14.

<sup>Written for commit 462bb3d.
Summary will update automatically on new commits.</sup>

<!-- End of auto-generated description by cubic. -->

Author: LeonardoNatale