Update Manopt requirement 0.6

Updates the requirements on [Manopt](https://github.com/JuliaManifolds/Manopt.jl) to permit the latest version.

Updates `Manopt` to 0.6.0
- [Release notes](https://github.com/JuliaManifolds/Manopt.jl/releases)
- [Changelog](https://github.com/JuliaManifolds/Manopt.jl/blob/master/Changelog.md)
- [Commits](JuliaManifolds/Manopt.jl@v0.5.25...v0.6.0)

---
updated-dependencies:
- dependency-name: Manopt
  dependency-version: 0.6.0
  dependency-type: direct:production
  dependency-group: all-julia-packages
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

test/Project.toml

@@ -22,7 +22,7 @@ Aqua = "0.8"
 ForwardDiff = "1.3.3"
 JET = "0.9,0.10,0.11"
 Manifolds = "0.10, 0.11"
-Manopt = "0.5.25"
+Manopt = "0.5.25, 0.6"
 Optimization = "5.6.1"
 OptimizationBase = "5.1.3"
 OptimizationManopt = "1.3.2"