build(deps): update semantic-version requirement from ~=2.8 to ~=2.9

Updates the requirements on [semantic-version](https://github.com/rbarrois/python-semanticversion) to permit the latest version.
- [Release notes](https://github.com/rbarrois/python-semanticversion/releases)
- [Changelog](https://github.com/rbarrois/python-semanticversion/blob/master/ChangeLog)
- [Commits](rbarrois/python-semanticversion@2.8.0...2.9.0)

---
updated-dependencies:
- dependency-name: semantic-version
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

_building/building-requirements.txt

@@ -1,6 +1,6 @@
 # requirements for building doc, setup.py etc
 
-semantic_version~=2.8
+semantic_version~=2.9
 jinja2~=2.11
 PyYAML~=6.0