TYPE: Address mypy complaints

[codecov[bot]]

Codecov Report

Merging #553 (8dde2f6) into master (c2a83a4) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #553   +/-   ##
=======================================
  Coverage   96.22%   96.22%           
=======================================
  Files          13       13           
  Lines        1591     1591           
=======================================
  Hits         1531     1531           
  Misses         60       60           

Impacted Files	Coverage Δ
rioxarray/raster_array.py	97.16% <ø> (ø)
rioxarray/rioxarray.py	96.94% <100.00%> (ø)

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[snowman2]

Thanks @justingruca 👍