Add changelog for v1.17.3

[willie-yao]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
This PR adds release notes for patch release v1.17.3

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

TODOs:

• squashed commits
• includes documentation
• adds unit tests
• cherry-pick candidate

Release note:

NONE

[mboersma]

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: e8b85d970242a2af1aa5a4b2eb8be7e0c82e8c9c

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mboersma

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Needs approval from an approver in each of these files:

• OWNERS [mboersma]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.41%. Comparing base (1957fc6) to head (1e2a2b8).
Report is 2 commits behind head on main.

Additional details and impacted files

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##             main    #5398   +/-   ##
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  Coverage   52.41%   52.41%           
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  Files         272      272           
  Lines       29361    29361           
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  Hits        15390    15390           
  Misses      13165    13165           
  Partials      806      806           

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