Upgrade accuracy metric initialization to recent torchmetrics release

[ashleve]

What does this PR do?

Adds task arg to accuracy metric for compatibility with recent torchmetrics release.

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[codecov-commenter]

Codecov Report

Base: 84.70% // Head: 84.70% // No change to project coverage 👍

Coverage data is based on head (5e1de61) compared to base (d1fdeef).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #475   +/-   ##
=======================================
  Coverage   84.70%   84.70%           
=======================================
  Files           9        9           
  Lines         353      353           
=======================================
  Hits          299      299           
  Misses         54       54           

Impacted Files	Coverage Δ
src/models/mnist_module.py	98.41% <100.00%> (ø)

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