Use ops.add for bias addition in EinsumDense

[DanisNone]

Replaced the use of the + operator with ops.add(x, bias) when adding the bias term in EinsumDense

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.57%. Comparing base (dfaca0e) to head (6cac2ca).

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #21299   +/-   ##
=======================================
  Coverage   82.57%   82.57%           
=======================================
  Files         564      564           
  Lines       54677    54677           
  Branches     8500     8500           
=======================================
  Hits        45152    45152           
  Misses       7435     7435           
  Partials     2090     2090           

Flag	Coverage Δ
keras	82.39% <100.00%> (ø)
keras-jax	63.61% <100.00%> (ø)
keras-numpy	58.74% <100.00%> (ø)
keras-openvino	33.04% <0.00%> (ø)
keras-tensorflow	64.02% <100.00%> (ø)
keras-torch	63.68% <100.00%> (ø)

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