build(deps): bump github.com/google/go-containerregistry from 0.20.6 to 0.21.8 in /modules/har - #93

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/setup-go@v5, arduino/setup-task@v2, golangci/golangci-lint-action@v6. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/