Use renovate bot to update versions

[surajssd]

Right now updating the versions is a manual task. Use the bot to update the various versions like github action versions, gpu operator version, network operator version, vllm version, etc.

• Docs: https://docs.renovatebot.com/
• Inspiration: https://github.com/Azure/aks-gpu/blob/2d3d2ba3ef42f29826b112d71f8c2e9caf5aaa9b/renovate.json#L1

[surajssd]

One more example: https://github.com/surajssd/llm-k8s/blob/main/.github/renovate.json

[surajssd]

Added the config, but the App is not enabled yet: #59 and #60