Disable HTTP/2 for webhooks until a fix come

[khrm]

We need to disable HTTP/2 for webhooks.

"
The go runtime does have a fix to mitigate the GHSA-qppj-fm5r-hxr3 to a degree, but as kubernetes/kubernetes#121197 shows, a single connection attempting to perform a denial-of-service attack against a go-based HTTP/2 server resulted in the server process quickly consuming 5 GB of memory. Additional connections would likely result in an OOM situation very quickly.
"
Please check this: kubernetes/kubernetes#121197

[khrm]

/kind security

[khrm]

/kind bug

[ReToCode]

Hey @khrm,
This is already done, check out
#2871
#2877
#2876
#2875

[khrm]

@ReToCode Thanks. We will do the release for Tekton after updating with the fix.