v0.6.3

Manopt v0.6.3

Diff since v0.6.2

Added

• an extra condition in the backtracking ProximalGradientMethodBacktrackingStepsize for the proximal_gradient_method. (#629)

Merged pull requests:

• Bump tarides/changelog-check-action from 3 to 4 (#628) (@dependabot[bot])
• Extra backtracking condition for prox-grad (#629) (@hajg-ijk)