[en] update cluster add-on link

[Arhell]

#49276

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[Okabe-Junya]

LGTM, but https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/addon-manager/README.md is better?

$ curl -I https://releases.k8s.io/master/cluster/addons/addon-manager/README.md
HTTP/2 302 
server: nginx
date: Sat, 04 Jan 2025 16:54:51 GMT
content-type: text/html
content-length: 138
location: https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/addon-manager/README.md
via: 1.1 google
alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000

[Okabe-Junya]

/assign sftim