New version: ProximalAlgorithms v0.7.0

[JuliaRegistrator]

• Registering package: ProximalAlgorithms
• Repository: https://github.com/JuliaFirstOrder/ProximalAlgorithms.jl
• Created by: @lostella
• Version: v0.7.0
• Commit: b34bf6444bfaa58a2b8eccb44fecea5fbec755b9
• Reviewed by: @lostella
• Reference: JuliaFirstOrder/ProximalAlgorithms.jl@b34bf64#commitcomment-150935026
• Description: Proximal algorithms for nonsmooth optimization in Julia
• Release notes:

## Breaking changes

- Updated autodiff backends from Zygote to DifferentiationInterface (#88, #90, #93)
- Bumped minimum Julia version to 1.6 (#95)

Check [this section of the documentation](https://juliafirstorder.github.io/ProximalAlgorithms.jl/v0.6.0/guide/custom_objectives/#custom_terms) on how to use the updated autodiff mechanism.

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[lostella]

[merge approved]