Bump hvplot from 0.8.2 to 0.8.4

Bumps [hvplot](https://github.com/holoviz/hvplot) from 0.8.2 to 0.8.4.
- [Release notes](https://github.com/holoviz/hvplot/releases)
- [Changelog](https://github.com/holoviz/hvplot/blob/main/doc/releases.md)
- [Commits](holoviz/hvplot@v0.8.2...v0.8.4)

environment.yml

@@ -62,7 +62,7 @@ dependencies:
   - bokeh~=3.2.2
   - cartopy~=0.21.1 # geospatial plotting with matplotlib
   - geoviews~=1.10.1
-  - hvplot==0.8.2
+  - hvplot~=0.8.4
   - ipyleaflet~=0.17.3
   - ipympl==0.9.2 # This enables matplotlib interaction with jupyter widgets
   - matplotlib==3.6.2