ci: use go version from go.mod for trivy

[Madhu-1]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug

/kind cleanup

/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:

actions/setup-go@v5 supports using go.mod to install the required version of golang, if any changes are required specific to version we dont need to make changes in 2 places.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

None

[k8s-ci-robot]

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This pull-request has been approved by: Madhu-1
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[Madhu-1]

/assign @xing-yang