Fixed import and added python-dateutil to dependencies

[ParthivNaresh]

Fixes: #1396
Fixes: #1393

[codecov]

Codecov Report

Merging #1397 (d34cee1) into main (b12e4b0) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1397   +/-   ##
=======================================
  Coverage   99.96%   99.96%           
=======================================
  Files          97       97           
  Lines       10410    10412    +2     
=======================================
+ Hits        10406    10408    +2     
  Misses          4        4           

Impacted Files	Coverage Δ
woodwork/deserializers/deserializer_base.py	100.00% <100.00%> (ø)
woodwork/deserializers/parquet_deserializer.py	100.00% <100.00%> (ø)
woodwork/serializers/parquet_serializer.py	100.00% <100.00%> (ø)

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[bchen1116]

Nice!