Remove warnings

[hoxbro]

Removing warnings from the CI. The goal is to have warnings raise an error in the CI.

Gridplot warning will be handled in: #5873

xarray warnings will be handled in another PR, as I'm not sure about what to do with them right now:

UserWarning: rename 'x' to 'x' does not create an index anymore. Try using swap_dims instead or use set_index after rename to create an indexed coordinate.
UserWarning: Converting non-nanosecond precision datetime values to nanosecond precision. This behavior can eventually be relaxed in xarray, as it is an artifact from pandas which is now beginning to support non-nanosecond precision values. This warning is caused by passing non-nanosecond np.datetime64 or np.timedelta64 values to the DataArray or Variable constructor; it can be silenced by converting the values to nanosecond precision ahead of time.

[codecov-commenter]

Codecov Report

Merging #5854 (53b79e1) into main (9d74f7e) will decrease coverage by 0.01%.
Report is 1 commits behind head on main.
The diff coverage is 97.29%.

@@            Coverage Diff             @@
##             main    #5854      +/-   ##
==========================================
- Coverage   88.35%   88.34%   -0.01%     
==========================================
  Files         310      310              
  Lines       63983    64001      +18     
==========================================
+ Hits        56529    56543      +14     
- Misses       7454     7458       +4     

Flag	Coverage Δ
ui-tests	23.41% <10.81%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
holoviews/core/data/ibis.py	76.54% <80.00%> (-0.34%)	⬇️
holoviews/core/data/pandas.py	93.47% <100.00%> (ø)
holoviews/core/util.py	86.07% <100.00%> (+0.04%)	⬆️
holoviews/element/chart.py	96.90% <100.00%> (+0.06%)	⬆️
holoviews/operation/timeseries.py	94.82% <100.00%> (+0.09%)	⬆️
holoviews/tests/core/data/base.py	100.00% <100.00%> (ø)
holoviews/tests/core/test_options.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[github-actions]

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