New version: Bumper v0.7.0

[JuliaRegistrator]

• Registering package: Bumper
• Repository: https://github.com/MasonProtter/Bumper.jl
• Created by: @MasonProtter
• Version: v0.7.0
• Commit: 6d160328e75bb0d830f559dfaee94e4e1cfceaba
• Reviewed by: @MasonProtter
• Reference: MasonProtter/Bumper.jl@6d16032#commitcomment-144491938
• Description: Bring Your Own Stack
• Release notes:

## Breaking changes

- The type of array created by `@alloc` and `alloc!` has been changed from a `StrideArraysCore.PtrArray` to `UnsafeArrays.UnsafeArray`. This shouldn't matter for most purposes, but can break code that relies on a specific return type.

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