chore(master): release 0.9.4

0.9.4 (2024-09-04)

docker: upgrade to Ubuntu 24.04 and Python 3.12 (#810) (69eb86b)
helm: add support for Kubernetes 1.30 (#799) (748ca07)
helm: add support for Kubernetes 1.31 (#822) (7da51d3)
python: add minimal pyproject.toml (#815) (9112171)
python: drop support for Python 3.6 and 3.7 (#793) (8762855)
python: remove deprecated pytest-runner (#815) (d9db515)
python: use optional deps instead of tests_require (#815) (668eee4)

config: add Compute4PUNCH backend (#780) (c2f490b)
config: new reana-demo-agc-cms-ttbar-coffea example (#792) (aff5c8f)
helm: add support for PgBouncer (#818) (7b472fe)
helm: add value to customise interactive session images (#795) (cd94d12)
helm: allow cluster administrator to configure ingress host (#804) (19ce68e)
helm: allow cluster administrator to configure ingress host (#804) (1479730)
helm: increase default rate limit values (#826) (fcecb6b), closes #825
helm: roll deployments when database config changes (#818) (04082f4)

helm: add NodePort services for debugging (#812) (33359ca)
helm: allow interactive-session-cleanup job to access RWC (#820) (a288636)
helm: use ingressClassName instead of deprecated annotation (#794) (b4f4633), closes #742

actions: update GitHub actions due to Node 16 deprecation (#790) (8ce4a8d)
commitlint: check PR number presence in merge commits (#810) (f1291ed)
commitlint: improve checking of merge commits (#803) (16e5542)
pytest: invoke pytest directly instead of setup.py test (#815) (a29f469)
python: pin setuptools 70 (#822) (be45c54)