Update dependency sphinx-rtd-theme to v3.0.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
sphinx-rtd-theme	==3.0.0 -> ==3.0.1

---

Release Notes

readthedocs/sphinx_rtd_theme (sphinx-rtd-theme)

### [`v3.0.1`](https://redirect.github.com/readthedocs/sphinx_rtd_theme/compare/3.0.0...3.0.1) [Compare Source](https://redirect.github.com/readthedocs/sphinx_rtd_theme/compare/3.0.0...3.0.1)

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• [ ] If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.