ioutil: remaining errors.Is conversions

[redwrasse]

Remaining errors.Is conversions, for the ioutils package, as part of #18576.

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Hi @redwrasse. Thanks for your PR.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.76%. Comparing base (6ea81c1) to head (48f29e0).

❗ Current head 48f29e0 differs from pull request most recent head c568ce6

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Additional details and impacted files

see 21 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #18619      +/-   ##
==========================================
- Coverage   68.78%   68.76%   -0.03%     
==========================================
  Files         420      420              
  Lines       35519    35519              
==========================================
- Hits        24431    24423       -8     
- Misses       9662     9666       +4     
- Partials     1426     1430       +4     

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[jmhbnz]

/ok-to-test

LGTM on green - Thanks @redwrasse

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, jmhbnz, redwrasse

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