EPSG codes are failing in process_crs

[jsignell]

ALL software version info

hvplot.__version__ = '0.9.2' 
geoviews.__version__ = '1.11.1' 
rasterio.__version__ = '1.3.9' 
xarray.__version__ = '2024.3.0' 
cartopy.__version__ = '0.22.0' 
pyproj.__version__ = '3.6.1' 

Description of expected behavior

process_crs should work for all EPSG codes. This works when using cartopy.crs directly:

import cartopy.crs as ccrs

ccrs.epsg(6933)

I think this was introduced in #1139

Complete, minimal, self-contained example code that reproduces the issue

from hvplot.util import preprocess_crs

preprocess_crs(6933)

Stack traceback and/or browser JavaScript console output

---------------------------------------------------------------------------
Exception                                 Traceback (most recent call last)
Exception: Unknown projection cea

The above exception was the direct cause of the following exception:

ValueError                                Traceback (most recent call last)
Cell In[64], line 3
      1 from hvplot.util import process_crs
----> 3 process_crs(6933)

File [/srv/conda/envs/notebook/lib/python3.11/site-packages/hvplot/util.py:288](https://hub.openveda.cloud/srv/conda/envs/notebook/lib/python3.11/site-packages/hvplot/util.py#line=287), in process_crs(crs)
    285     except Exception as e:
    286         errors.append(e)
--> 288 raise ValueError(
    289     "Projection must be defined as a EPSG code, proj4 string, "
    290     "WKT string, cartopy CRS, pyproj.Proj, or pyproj.CRS."
    291 ) from Exception(*errors)

ValueError: Projection must be defined as a EPSG code, proj4 string, WKT string, cartopy CRS, pyproj.Proj, or pyproj.CRS.

Screenshots or screencasts of the bug in action

• I may be interested in making a pull request to address this

[jsignell]

I will have a PR up shortly