build: bump version to v0.20.4

[ziggie1984]

Bumps the version from 0.20.4-beta.rc1 to 0.20.4-beta, dropping the release candidate suffix for the final v0.20.4 release.

This mirrors the previous release-candidate → final transitions done for v0.20.3 (#11062) and v0.20.2 (#10953).

[github-actions]

🟡 PR Severity: MEDIUM

gh pr view | 1 files | 2 lines changed

🟡 Medium (1 files)

• build/version.go - uncategorized Go file (version string bump); not part of any critical/high-severity package

Analysis

This PR only touches build/version.go, changing the version string from 0.20.4-beta.rc1 to 0.20.4-beta to drop the release-candidate suffix ahead of the final v0.20.4 release. It mirrors prior release-candidate → final transitions (#‌11062, #‌11063 for v0.20.3/v0.20.2). The file isn't part of any critical or high-severity package list, the diff is a single line change in a single file, and there's no functional code impact — so it's classified as a routine, low-risk MEDIUM change (default bucket for uncategorized Go files).

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_{To override, add a severity-override-{critical,high,medium,low} label.}

[Roasbeef]

LGTM