Update pip-tools version in the README's pre-commit examples

[Kludex]

The version mentioned there causes an error on the pre-commit, which is fixed on the current version. 👀

Contributor checklist

• Provided the tests for the changes.
• Assure PR title is short, clear, and good to be included in the user-oriented changelog

Maintainer checklist

• Assure one of these labels is present: backwards incompatible, feature, enhancement, deprecation, bug, dependency, docs or skip-changelog as they determine changelog listing.
• Assign the PR to an existing or new milestone for the target version (following Semantic Versioning).

[atugushev]

I wonder is there any GitHub Action to update those versions after a release is published? Would be nice to keep them up-to-date.

[webknjaz]

It's not hard to build such a workflow — the GHA token let's you git push from CI