chore(deps): update dependency micromark-extension-gfm to v3 (#165)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[micromark-extension-gfm](https://togithub.com/micromark/micromark-extension-gfm)
| [`^2.0.1` ->
`^3.0.0`](https://renovatebot.com/diffs/npm/micromark-extension-gfm/2.0.1/3.0.0)
|
[![age](https://badges.renovateapi.com/packages/npm/micromark-extension-gfm/3.0.0/age-slim)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://badges.renovateapi.com/packages/npm/micromark-extension-gfm/3.0.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://badges.renovateapi.com/packages/npm/micromark-extension-gfm/3.0.0/compatibility-slim/2.0.1)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://badges.renovateapi.com/packages/npm/micromark-extension-gfm/3.0.0/confidence-slim/2.0.1)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>micromark/micromark-extension-gfm
(micromark-extension-gfm)</summary>

###
[`v3.0.0`](https://togithub.com/micromark/micromark-extension-gfm/releases/tag/3.0.0)

[Compare
Source](https://togithub.com/micromark/micromark-extension-gfm/compare/2.0.3...3.0.0)

-
[`004cb2e`](https://togithub.com/micromark/micromark-extension-gfm/commit/004cb2e)
Change to require Node.js 16
    **migrate**: update Node
-
[`c6c3114`](https://togithub.com/micromark/micromark-extension-gfm/commit/c6c3114)
Change to use `export` map
    **migrate**: don’t use private APIs
-
[`b066ffd`](https://togithub.com/micromark/micromark-extension-gfm/commit/b066ffd)
Update `micromark`

**Full Changelog**:
micromark/micromark-extension-gfm@2.0.3...3.0.0

###
[`v2.0.3`](https://togithub.com/micromark/micromark-extension-gfm/releases/tag/2.0.3)

[Compare
Source](https://togithub.com/micromark/micromark-extension-gfm/compare/2.0.2...2.0.3)

(same as 2.0.2, but regenerates types, which were generated by an older
TS it seems)

**Full Changelog**:
micromark/micromark-extension-gfm@2.0.2...2.0.3

###
[`v2.0.2`](https://togithub.com/micromark/micromark-extension-gfm/releases/tag/2.0.2)

[Compare
Source](https://togithub.com/micromark/micromark-extension-gfm/compare/2.0.1...2.0.2)

##### Misc

-
[`84ef0bc`](https://togithub.com/micromark/micromark-extension-gfm/commit/84ef0bc)
[`1c7482f`](https://togithub.com/micromark/micromark-extension-gfm/commit/1c7482f)
Add improved docs
-
[`56f2a8f`](https://togithub.com/micromark/micromark-extension-gfm/commit/56f2a8f)
[`f9b3161`](https://togithub.com/micromark/micromark-extension-gfm/commit/f9b3161)
[`942585e`](https://togithub.com/micromark/micromark-extension-gfm/commit/942585e)
Refactor code-style
-
[`71e61e0`](https://togithub.com/micromark/micromark-extension-gfm/commit/71e61e0)
[`55db44b`](https://togithub.com/micromark/micromark-extension-gfm/commit/55db44b)
Refactor types
-
[`17ae119`](https://togithub.com/micromark/micromark-extension-gfm/commit/17ae119)
Regenerate tests

**Full Changelog**:
micromark/micromark-extension-gfm@2.0.1...2.0.2

</details>

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packages/markdown/package.json

@@ -29,7 +29,7 @@
     "hast-util-to-string": "^2.0.0",
     "micromark": "^4.0.0",
     "micromark-extension-directive": "^2.1.2",
-    "micromark-extension-gfm": "^2.0.1",
+    "micromark-extension-gfm": "^3.0.0",
     "micromark-extension-wiki-link": "^0.0.4",
     "rehype": "^12.0.1",
     "rehype-autolink-headings": "^6.1.1",