updates:
- [github.com/astral-sh/ruff-pre-commit: v0.8.0 → v0.8.1](astral-sh/ruff-pre-commit@v0.8.0...v0.8.1)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

updates:
- [github.com/astral-sh/ruff-pre-commit: v0.8.2 → v0.8.3](astral-sh/ruff-pre-commit@v0.8.2...v0.8.3)

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Bumps [mypy](https://github.com/python/mypy) from 1.13.0 to 1.14.0.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.13.0...v1.14.0)

---
updated-dependencies:
- dependency-name: mypy
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Bumps [astral-sh/setup-uv](https://github.com/astral-sh/setup-uv) from 4 to 5.
- [Release notes](https://github.com/astral-sh/setup-uv/releases)
- [Commits](astral-sh/setup-uv@v4...v5)

---
updated-dependencies:
- dependency-name: astral-sh/setup-uv
  dependency-type: direct:production
  update-type: version-update:semver-major
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* chore(studio): Update Studio URL to new domain

The https://studio.dvc.ai is deprecated, and we switched to the new domain https://studio.datachain.ai.

The domain change is backwards compatible. The **older versions** of the `dvc` will still work. 🎉

Related PR: iterative/dvc-studio-client#181

* Apply suggestions from code review

---------

Co-authored-by: Marcin Jasion <mjasion@users.noreply.github.com>
Co-authored-by: Helio Machado <0x2b3bfa0+git@googlemail.com>

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python/cpython#113829 changed `os.path.isabs` on Windows to not consider a path starting a single backslash to be an absolute path.

We do a lot of naive `posixpath` to `ntpath` conversions, and it broke DVC in multiple places. DVC is likely broken in many other places, and these bugs are difficult to identify.

In this commit, I have tried to fix in the places where the tests failed. And mostly by trying to imitate pre-3.13 behaviour.
Some of the changes may not be correct but keeps the old behaviour in place.

Also re-enabled the CI for all Python versions supported for Windows.