Update dependency mkdocs-include-markdown-plugin to v6.0.3 (#214)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[mkdocs-include-markdown-plugin](https://togithub.com/mondeja/mkdocs-include-markdown-plugin#documentation)
([changelog](https://togithub.com/mondeja/mkdocs-include-markdown-plugin/releases))
| `6.0.2` -> `6.0.3` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/mkdocs-include-markdown-plugin/6.0.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/mkdocs-include-markdown-plugin/6.0.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/mkdocs-include-markdown-plugin/6.0.2/6.0.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/mkdocs-include-markdown-plugin/6.0.2/6.0.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>mondeja/mkdocs-include-markdown-plugin
(mkdocs-include-markdown-plugin)</summary>

###
[`v6.0.3`](https://togithub.com/mondeja/mkdocs-include-markdown-plugin/releases/tag/v6.0.3)

[Compare
Source](https://togithub.com/mondeja/mkdocs-include-markdown-plugin/compare/v6.0.2...v6.0.3)

#### Enhancements

-   Add `mkdocs>=1.4` as dependency.

</details>

---

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