Update kubernetes.mdx

[imuneeeb]

Summary

This PR updates the Cloudflare Zero Trust Kubernetes Deployment Manifests to address the warning:
WRN The user running cloudflared process has a GID (group ID) that is not within ping_group_range. You might need to add that user to a group within that range, or instead update the range to encompass a group the user is already in by modifying /proc/sys/net/ipv4/ping_group_range. Otherwise cloudflared will not be able to ping this network error="Group ID 65532 is not between ping group 1 to 0"

The change adds a securityContext with a sysctls configuration to explicitly set net.ipv4.ping_group_range to "65532 65532".
This configuration ensures that the warning no longer appears when running the deployment.

Screenshots (optional)

N/A

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page - an issue has been opened in relation to any incorrect or out-of-date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

[imuneeeb]

@ranbel Kindly have a look

[ranbel]

Hi @imuneeeb, thanks for the PR! I've asked the Tunnel team to review it.

[ranbel]

While we haven't tested this specific configuration, the PR looks fine.

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