This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
|
[pymdown-extensions](https://redirect.github.com/facelessuser/pymdown-extensions)
| minor | `==10.12` -> `==10.13` |

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### Release Notes

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

###
[`v10.13`](https://redirect.github.com/facelessuser/pymdown-extensions/releases/tag/10.13)

[Compare
Source](https://redirect.github.com/facelessuser/pymdown-extensions/compare/10.12...10.13)

#### 10.13

- **NEW**: Snippets: Allow multiple line numbers or line number blocks
separated by `,`.
- **NEW**: Snippets: Allow using a negative index for number start
indexes and end indexes. Negative indexes are converted to positive
indexes based on the number of lines in the snippet.
-   **FIX**: Snippets: Properly capture empty newline at end of file.
- **FIX**: Snippets: Fix issue where when non sections of files are
included, section labels are not stripped.
-   **FIX**: BetterEm: Fixes for complex cases.
- **FIX**: Blocks: More consistent handling of empty newlines in block
processor extensions.

</details>

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