Updates for Python 3.10 deprecations

[philippjfr]

• from collections import Callable -> from collections.abc import Callable
• from distutils.version import LooseVersion -> from packaging.version import Version

[codecov]

Codecov Report

Merging #3065 (caabdab) into master (3e2c416) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #3065   +/-   ##
=======================================
  Coverage   83.42%   83.42%           
=======================================
  Files         190      190           
  Lines       25134    25134           
=======================================
  Hits        20969    20969           
  Misses       4165     4165           

Impacted Files	Coverage Δ
panel/pane/holoviews.py	79.87% <100.00%> (ø)
panel/param.py	87.03% <100.00%> (+0.02%)	⬆️
panel/tests/pane/test_vega.py	97.59% <100.00%> (ø)
panel/tests/test_pipeline.py	98.94% <100.00%> (ø)
panel/tests/test_template.py	98.60% <100.00%> (-0.01%)	⬇️
panel/tests/util.py	84.61% <100.00%> (ø)
panel/tests/widgets/test_tables.py	99.49% <100.00%> (ø)
panel/util.py	84.58% <100.00%> (ø)

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