Update dependency pymdown-extensions to v10.3.1 (#153)

[![Mend
Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[pymdown-extensions](https://togithub.com/facelessuser/pymdown-extensions)
| `==10.3` -> `==10.3.1` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/pymdown-extensions/10.3.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/pymdown-extensions/10.3.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/pymdown-extensions/10.3/10.3.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/pymdown-extensions/10.3/10.3.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>facelessuser/pymdown-extensions (pymdown-extensions)</summary>

###
[`v10.3.1`](https://togithub.com/facelessuser/pymdown-extensions/releases/tag/10.3.1)

[Compare
Source](https://togithub.com/facelessuser/pymdown-extensions/compare/10.3...10.3.1)

#### 10.3.1

- **FIX**: SuperFences: Fix an issue where braces were not handled
properly in attributes.

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "on the first day of the month" (UTC),
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you
are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

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

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR has been generated by [Mend
Renovate](https://www.mend.io/free-developer-tools/renovate/). View
repository job log
[here](https://developer.mend.io/github/python-humanize/humanize).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNy4zMS41IiwidXBkYXRlZEluVmVyIjoiMzcuMzEuNSIsInRhcmdldEJyYW5jaCI6Im1haW4ifQ==-->

Author: hugovk

docs/requirements.txt

@@ -3,4 +3,4 @@ mkdocs-material
 mkdocstrings[python]==0.23.0
 mkdocs-include-markdown-plugin
 pygments
-pymdown-extensions==10.3
+pymdown-extensions==10.3.1