build(deps): bump pip from 24.2 to 26.0.1 in /backend

Bumps [pip](https://github.com/pypa/pip) from 24.2 to 26.0.1.
- [Changelog](https://github.com/pypa/pip/blob/main/NEWS.rst)
- [Commits](pypa/pip@24.2...26.0.1)

---
updated-dependencies:
- dependency-name: pip
  dependency-version: 26.0.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]