Enhancement: Reduce progress bar refresh rates to decrease energy usage

Progress bars were previously updated at 60 frames per second, which
could cause high CPU or GPU usage in some terminal emulators.

The refresh rate is now 10 FPS to conserve energy. For some terminal
emulators, the lower rate is also necessary to allow selecting text
in the terminal.

https://github.com/restic/restic/issues/5383
https://github.com/restic/restic/pull/5551
https://github.com/restic/restic/pull/5626
