chore: update Go version to 1.26.4#2568
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Use Go 1.26.4 for vulnerability scanning and Docker builder images so published Ratify images are built with the patched standard library. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Signed-off-by: xinhl <xinhl@microsoft.com>
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Summary
Update Go usage to 1.26.4 only where it affects vulnerability scanning or published image builds.
Motivation
Go 1.26.4 includes fixes for the Go standard library vulnerabilities reported by govulncheck:
Updating only the govulncheck workflow is not sufficient because GHCR-published Ratify images are built by Dockerfile builder stages. If the Dockerfile still uses Go 1.26.3, the resulting binary is still built with the vulnerable Go standard library.
Changes
scan-vulnsgovulncheck toolchain to Go 1.26.4go.modunchanged1.26) minor-only; update only workflow references that were already patch-pinned to1.26.3Validation
go.mod.