Update Go version in GitHub workflows from 1.21 to 1.19

[Copilot]

This PR updates the Go version specified in GitHub workflow files from 1.21 to 1.19 to ensure consistency with the Go version requirement in go.mod.

Changes Made

• Updated .github/workflows/codecov.yml: Changed go-version: 1.21 to go-version: 1.19
• Updated .github/workflows/gosec.yml: Changed go-version: 1.21 to go-version: 1.19

Rationale

The go.mod file already specifies Go 1.19 as the minimum required version:

module github.com/broothie/qst

go 1.19

However, the GitHub workflows were using Go 1.21, creating an inconsistency. This change ensures that:

1. All workflow files use the same Go version (1.19)
2. The CI/CD pipeline uses the same Go version as specified in the project requirements
3. There's consistency across the entire project's Go version specification

Testing

• ✅ Project builds successfully with Go 1.19
• ✅ All tests pass with Go 1.19
• ✅ No other references to Go 1.21 remain in the codebase

The changes are minimal and surgical, affecting only the version specification in the GitHub Actions setup steps.

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