chore: downgrade golangci-lint version

[dbrent-rp]

Description

Downgrading the glangci-lint version from 2.12.0 (released today) to 2.11.4
Jira Issue: https://revolutionparts.atlassian.net/browse/

Background

2.12.0 is far more aggressive with linting than 2.11.4 and the lint failures are blocking a P0 fix from going out

Testing Information

[cursor]

PR Summary

Low Risk
Low risk: this only changes the CI lint tool version to reduce/avoid new lint failures; it does not affect runtime code or production behavior.

Overview
Pins the golangci-lint-action in .github/workflows/go-test.yaml to use golangci-lint v2.11.4 instead of latest, stabilizing CI linting behavior and avoiding unexpected failures from newer releases.

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