Release 9.4.0.0

[smelc]

Changelog

- description: |
    Release 9.4.0.0
# uncomment types applicable to the change:
  type:
  # - feature        # introduces a new feature
  # - breaking       # the API has changed in a breaking way
  # - compatible     # the API has changed but is non-breaking
  # - optimisation   # measurable performance improvements
  # - refactoring    # QoL changes
  # - bugfix         # fixes a defect
  # - test           # fixes/modifies tests
  # - maintenance    # not directly related to the code
  - release        # related to a new release preparation
  # - documentation  # change in code docs, haddocks...

Context

Corresponding CHaP PR: IntersectMBO/cardano-haskell-packages#924

[smelc]

Tag created and CHaP PR merged, so enqueueing for merge