pyviz/holoviews: Version 1.12.0

This release provides a number of exciting new features as well as a set of important bug fixes. Many thanks to our users for reporting these issues, and special thanks to @ahuang11, @jonmmease, @poplarShift, @reckoner, @scottclowe and @syhooper for their contributions to the code and the documentation. Features: New plot options for controlling layouts including a responsive mode as well as improved control over aspect using the newly updated bokeh layout engine (#3450, #3575) Added a succinct and powerful way of creating DynamicMaps from functions and methods via the new .apply method (#3554, #3474) Enhancements: Added a number of new plot options including a clabel param for colorbars (#3517), exposed Sankey font size (#3535) and added a radius for bokeh nodes (#3556) Switched notebook output to use an HTML mime bundle instead of separate HTML and JS components (#3574) Improved support for style mapping constant values via dim.categorize (#3578) Bug fixes: Fixes for colorscales and colorbars (#3572, #3590) Other miscellaneous fixes(#3530, #3536, #3546, #3560, #3571, #3580, #3584, #3585, #3594