Bump kapp-controller to version 0.38.4

[shivaani0505]

What this PR does / why we need it

Bump kapp-controller to version 0.38.4

Which issue(s) this PR fixes

Fixes #2879

Describe testing done for PR

Changes in this PR have been run with bom
https://github.com/vmware-tanzu/tanzu-framework/pull/2880#issuecomment-1179547191
All tests are passing with new bom

Release note

Bump kapp-controller to version 0.38.4 

PR Checklist

• Squash the commits into one or a small number of logical commits
  
• Use good commit messages
• Ensure PR contains terms all contributors can understand and links all contributors can access

Additional information

Special notes for your reviewer

[github-actions]

Cluster Generation A/B Results:
https://storage.googleapis.com/tkg-clustergen/2880/20220708195254/clustergen.diff.txt
Author/reviewers:
Please review to verify that the effects on the generated cluster configurations are exactly what the PR intended, and give a thumbs-up if so.

[github-actions]

Cluster Generation A/B Results:
https://storage.googleapis.com/tkg-clustergen/2880/20220708200539/clustergen.diff.txt
Author/reviewers:
Please review to verify that the effects on the generated cluster configurations are exactly what the PR intended, and give a thumbs-up if so.

[codecov]

Codecov Report

Merging #2880 (9305a72) into main (8711537) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2880      +/-   ##
==========================================
- Coverage   43.83%   43.81%   -0.03%     
==========================================
  Files         414      414              
  Lines       41295    41295              
==========================================
- Hits        18103    18092      -11     
- Misses      21499    21508       +9     
- Partials     1693     1695       +2     

Impacted Files	Coverage Δ
addons/controllers/clusterbootstrap_controller.go	62.93% <0.00%> (-0.98%)	⬇️

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[shyaamsn]

//usebom:sandbox/v1.6.0-zshippable/415732029582267120/tkg-compatibility

[vijaykatam]

As @shyaamsn mentioned offline, lets enqueue airgap testing for this change.