ToC does not play well when sections are numbered

Bug description

When both toc: true and number-sections: true are set, the section number is added twice in the ToC, resulting in dead links when one clicks on them in the ToC.
Small reproducible example (running under quarto v0.9.566 and RStudio 2022.02.3 Build 492 on macOS Monterey)

---
title: "toc-gfm-numbered-sections"
author: "Aymeric Stamm"
format:
  gfm: default
  html: default
editor: visual
toc: true
number-sections: true
---

## H1

### Sub-H1

## H2

Checklist

• formatted your issue so it is easier for us to read?
• included a minimal, self-contained, and reproducible example?
• documented the quarto version you're running, by providing the output produced by quarto check in a terminal in your issue?
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• documented which operating system you're running? If on Linux, please provide the specific distribution as well.
• upgraded to the latest version, including your versions of R, the RStudio IDE, and relevant R packages?