New version: Oceananigans v0.54.0

[JuliaRegistrator]

• Registering package: Oceananigans
• Repository: https://github.com/CliMA/Oceananigans.jl
• Created by: @ali-ramadhan
• Version: v0.54.0
• Commit: 964befefcbdb4790f8b6c0a66518fae87a8e3f07
• Reviewed by: @ali-ramadhan
• Reference: CliMA/Oceananigans.jl@964befe#commitcomment-48858913
• Release notes:

Breaking changes:

• When constructing boundary conditions, use the long form constructors: FluxBoundaryCondition(...) instead of BoundaryCondition(Flux, ...) and so on.
• To tilt gravity, the Buoyancy keyword argument changed from gravitational_unit_vector to vertical_unit_vector.

[github-actions]

Your new version pull request met all of the guidelines for auto-merging and is scheduled to be merged in the next round.

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