Bump markdown-exec from 1.8.2 to 1.8.3 (#123)

Bumps [markdown-exec](https://github.com/pawamoy/markdown-exec) from 1.8.2 to 1.8.3.
- [Release notes](https://github.com/pawamoy/markdown-exec/releases)
- [Changelog](https://github.com/pawamoy/markdown-exec/blob/main/CHANGELOG.md)
- [Commits](pawamoy/markdown-exec@1.8.2...1.8.3)

---
updated-dependencies:
- dependency-name: markdown-exec
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -1,5 +1,5 @@
 dataclasses-json==0.6.6
-markdown-exec==1.8.2
+markdown-exec==1.8.3
 mkdocs==1.6.0
 mkdocs-autorefs==1.0.1
 mkdocs-bibtex==2.15.0