Update instructions to install cfssl

[dims]

go get does not work anymore, please see #111351 for the error.

So we switch to go install as documented in cfssl:
https://github.com/cloudflare/cfssl/#installation

/kind cleanup

Use the newer "go install" variant as we are above go 1.18

Signed-off-by: Davanum Srinivas davanum@gmail.com

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[dims]

/sig architecture

[SataQiu]

/lgtm
/approve

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