Bump betamax from 0.8.1 to 0.9.0

Bumps [betamax](https://github.com/sigmavirus24/betamax) from 0.8.1 to 0.9.0.
- [Release notes](https://github.com/sigmavirus24/betamax/releases)
- [Changelog](https://github.com/betamaxpy/betamax/blob/main/HISTORY.rst)
- [Commits](betamaxpy/betamax@0.8.1...0.9.0)

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

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

requirements.txt

@@ -11,7 +11,7 @@ semver==3.0.2
 # testing
 pytest==8.1.0
 pytest-xdist[psutil]==3.5.0
-betamax==0.8.1
+betamax==0.9.0
 coverage~=7.4.3  # pinned to <7 as coveralls is preventing v7 for coverage
 pytest-cov==4.1.0
 coveralls==3.3.1