chore(requirements): bump ruamel.yaml to 0.18.6

[bernylinville]

What type of PR is this? /kind cleanup

What this PR does / why we need it: Updates ruamel.yaml package to version 0.18.6 in requirements.txt. This package is required for the inventory builder functionality.

Which issue(s) this PR fixes: NONE

Special notes for your reviewer: This is a routine dependency update to maintain compatibility with the inventory builder.

Does this PR introduce a user-facing change?:

[k8s-ci-robot]

Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

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[linux-foundation-easycla[bot]]

• :white_check_mark:login: bernylinville / (f330852a3e3bb4ab8ffd114b5e45921cf40b1833)

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: bernylinville Once this PR has been reviewed and has the lgtm label, please assign yankay for approval. For more information see the Kubernetes Code Review Process.

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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @bernylinville. Thanks for your PR.

I'm waiting for a kubernetes-sigs 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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Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[bernylinville]

/ok-to-test

[k8s-ci-robot]

@bernylinville: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to [this](https://github.com/kubernetes-sigs/kubespray/pull/11731#issuecomment-2490199062): >/ok-to-test Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[bernylinville]

/retest

[k8s-ci-robot]

@bernylinville: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to [this](https://github.com/kubernetes-sigs/kubespray/pull/11731#issuecomment-2490201355): >/retest Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[yankay]

/ok-to-test

[VannTen]

https://github.com/kubernetes-sigs/kubespray/pull/11465#issuecomment-2312083977