org REQUEST: New membership for xrstf

@xrstf

kubernetes, kubernetes-sigs

[X] I have reviewed the community membership guidelines
[X] I have enabled 2FA on my GitHub account
[X] I have subscribed to the kubernetes dev e-mail list
[X] I am actively contributing to 1 or more Kubernetes subprojects
[X] I have two sponsors that meet the sponsor requirements listed in the community membership guidelines
[X] I have spoken to my sponsors ahead of this application, and they have agreed to sponsor my application
[X] I have verified that my sponsors are from different member companies
[X] I have verified that my sponsors are a reviewer or an approver in at least one OWNERS file within one of the Kubernetes GitHub organizations (excluding the contributor-playground)
[X] SUGGESTED: Ensure your affiliation in gitdm is up to date (gitdm is used by devstats to track affiliation)
[X] SUGGESTED: Ensure your affiliation in openprofile.dev is up to date (used by LFX Insights to track affiliation, will replace gitdm in the future)
[ ] SUGGESTED: I have taken the Inclusive Open Source Community Orientation course

@sttts

@alvaroaleman

kubernetes-sigs/hydrophone:
- kubernetes-sigs/hydrophone#163
- kubernetes-sigs/hydrophone#164
- kubernetes-sigs/hydrophone#165
- kubernetes-sigs/hydrophone#166
- kubernetes-sigs/hydrophone#171
- kubernetes-sigs/hydrophone#172
- kubernetes-sigs/hydrophone#174
kubernetes-sigs/controller-runtime:
- kubernetes-sigs/controller-runtime/pull/2531
kubernetes/docs:
- kubernetes/website#43076
- kubernetes/website#43084
kubernetes/test-infra:
- kubernetes/test-infra#30776