update changelog for v0.20.5

[vivek-koppuru]

Issue #, if available:

Description of changes:

Testing (if applicable):

Documentation added/planned (if applicable):

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.57%. Comparing base (36abaa6) to head (070ca57).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8720      +/-   ##
==========================================
- Coverage   73.58%   73.57%   -0.01%     
==========================================
  Files         578      578              
  Lines       36635    36629       -6     
==========================================
- Hits        26957    26951       -6     
+ Misses       7952     7951       -1     
- Partials     1726     1727       +1     

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[vivek-koppuru]

/retest

[abhay-krishna]

/lgtm
/approve

[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: abhay-krishna

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[rahulbabu95]

Suggested change

	- Rollout new nodes for OSImageURL change on spec without changing K8s version ([#8656](https://github.com/aws/eks-anywhere/pull/8656))
	- Rollout new nodes for OSImageURL change on baremetal cluster spec without changing K8s version ([#8656](https://github.com/aws/eks-anywhere/pull/8656))
	or
	- Rollout new nodes for OSImageURL change on spec without changing K8s version for baremetal clusters ([#8656](https://github.com/aws/eks-anywhere/pull/8656))

[vivek-koppuru]

/cherrypick release-0.20

[vivek-koppuru]

/cherry-pick release-0.20

[eks-distro-pr-bot]

@vivek-koppuru: new pull request created: #8725

In response to this:

/cherrypick release-0.20

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[eks-distro-pr-bot]

@vivek-koppuru: new pull request could not be created: failed to create pull request against aws/eks-anywhere#release-0.20 from head eks-distro-pr-bot:cherry-pick-8720-to-release-0.20: status code 422 not one of [201], body: {"message":"Validation Failed","errors":[{"resource":"PullRequest","code":"custom","message":"A pull request already exists for eks-distro-pr-bot:cherry-pick-8720-to-release-0.20."}],"documentation_url":"https://docs.github.com/rest/pulls/pulls#create-a-pull-request","status":"422"}

In response to this:

/cherry-pick release-0.20

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.