audacity: Update to 2.4.1

Changes in version 2.4.1:

Critical Bug Fix:
* Audacity 2.4.0 was released with a critical bug, (Bug 2436),
  which is fixed in 2.4.1.  The bug caused loss of data when using two projects at the same time.

Improvements

* Audacity now runs on Mac Catalina.
* A new Time Toolbar showing current record/playback time has been
  split from the Selection Toolbar.  It can be resized large.
* Presets for more effects can be imported and exported.
* A new Multi-View mode for tracks.  In this mode both
  spectrogram and waveform views are shown at the same time.
* Opus available as a new audio export format on Windows and Linux.
* Easier to convert labels between point labels and range labels.
* New Loudness Normalization effect.
* New RMS measurement analyzer.
* New Noise Gate effect.
* New Spectral Delete effect.

See also: https://wiki.audacityteam.org/wiki/New_features_in_Audacity_2.4.1

Bug Fixes

Over 100 bugs in 2.3.3 fixed, including:

* 2237 - Equalization effects have no Import or Export for curves
* 2261 - Graphic EQ sliders have no frequency labels
* 2265 - Track heights are reset to default on project re-opening
* 2303 - Playback does not start at the saved cursor position on reopening a saved project.
* 2314 - Zoom in fail when playing

(nia)