Update beautifulsoup4 requirement from <4.9,>=4.8 to >=4.8,<4.13 (#1287)

Updates the requirements on [beautifulsoup4](https://www.crummy.com/software/BeautifulSoup/bs4/) to permit the latest version.

---
updated-dependencies:
- dependency-name: beautifulsoup4
  dependency-type: direct:development
...

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

Author: dependabot[bot]

dev-requirements.txt

@@ -1,5 +1,5 @@
 # Only for testing
-beautifulsoup4>=4.8,<4.9
+beautifulsoup4>=4.8,<4.13
 coverage>=4.5,<7.7
 pytest
 pytest-cov