New version: Manopt v0.5.3

[JuliaRegistrator]

• Registering package: Manopt
• Repository: https://github.com/JuliaManifolds/Manopt.jl
• Created by: @kellertuer
• Version: v0.5.3
• Commit: abe1286903ca41d5b16ab3db784756211d694725
• Reviewed by: @kellertuer
• Reference: JuliaManifolds/Manopt.jl@abe1286#commitcomment-148138715
• Description: 🏔️Manopt. jl – Optimization on Manifolds in Julia
• Release notes:

### Added

* `StopWhenChangeLess`, `StopWhenGradientChangeLess` and `StopWhenGradientLess` can now use the new idea (ManifoldsBase.jl 0.15.18) of different outer norms on manifolds with components like power and product manifolds and all others that support this from the `Manifolds.jl` Library, like `Euclidean`.

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