chore(deps): bump xlsxwriter in /backend/requirements

Bumps [xlsxwriter](https://github.com/jmcnamara/XlsxWriter) from 3.1.7 to 3.2.0.
- [Changelog](https://github.com/jmcnamara/XlsxWriter/blob/main/Changes)
- [Commits](jmcnamara/XlsxWriter@RELEASE_3.1.7...RELEASE_3.2.0)

---
updated-dependencies:
- dependency-name: xlsxwriter
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

backend/requirements/base.txt

@@ -25,4 +25,4 @@ PyYAML==6.0.1
 typing-extensions==4.8.0
 WeasyPrint==61.2
 whitenoise==6.6.0
-XlsxWriter==3.1.7
+XlsxWriter==3.2.0