Fix remaining pyink issues

[cgarciae]

What does this PR do?

Run pyink again

[codecov-commenter]

Codecov Report

Merging #3219 (f86fd1c) into main (39e3e32) will decrease coverage by 0.07%.
The diff coverage is 82.29%.

@@            Coverage Diff             @@
##             main    #3219      +/-   ##
==========================================
- Coverage   82.33%   82.26%   -0.07%     
==========================================
  Files          54       54              
  Lines        6073     6078       +5     
==========================================
  Hits         5000     5000              
- Misses       1073     1078       +5     

Impacted Files	Coverage Δ
flax/configurations.py	89.65% <ø> (ø)
flax/core/partial_eval.py	100.00% <ø> (ø)
flax/ids.py	96.00% <ø> (ø)
flax/testing/benchmark.py	0.00% <0.00%> (ø)
flax/training/common_utils.py	0.00% <0.00%> (ø)
flax/training/dynamic_scale.py	0.00% <0.00%> (ø)
flax/training/lr_schedule.py	0.00% <ø> (ø)
flax/training/orbax_utils.py	69.44% <ø> (ø)
flax/training/prefetch_iterator.py	0.00% <ø> (ø)
flax/training/train_state.py	83.33% <ø> (ø)
... and 39 more