chore: remove refs to deprecated io/ioutil

[testwill]

Description of the change:

Motivation for the change:

Reviewer Checklist

• Implementation matches the proposed design, or proposal is updated to match implementation
• Sufficient unit test coverage
• Sufficient end-to-end test coverage
• Docs updated or added to /docs
• Commit messages sensible and descriptive

[openshift-ci]

Hi @testwill. Thanks for your PR.

I'm waiting for a operator-framework member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (6cb25c2) 53.32% compared to head (74e336e) 53.27%.

Files	Patch %	Lines
pkg/lib/bundle/generate.go	77.77%	1 Missing and 1 partial ⚠️
pkg/lib/indexer/indexer.go	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1167      +/-   ##
==========================================
- Coverage   53.32%   53.27%   -0.05%     
==========================================
  Files         108      108              
  Lines       10337    10340       +3     
==========================================
- Hits         5512     5509       -3     
- Misses       3841     3845       +4     
- Partials      984      986       +2     

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[dinhxuanvu]

/ok-to-test

[joelanford]

/approve
/lgtm

Thank you!

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: joelanford, testwill

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