Fix release workflow Go version

[octosteve]

• Update release workflow to use cli/gh-extension-precompile@v2 and read Go version from go.mod (avoids defaulting to Go 1.18, which can't parse go 1.24/toolchain).\n- Bump actions/checkout to v6 across workflows.

[Copilot]

Pull request overview

This PR fixes the release workflow to properly handle modern Go versions by upgrading to cli/gh-extension-precompile@v2 and configuring it to read the Go version from go.mod. This prevents the workflow from defaulting to Go 1.18, which cannot parse the go 1.24/toolchain syntax used in the project's go.mod file. Additionally, actions/checkout is bumped from v3 to v6 across all workflows.

• Updated release workflow to use cli/gh-extension-precompile@v2 with go_version_file parameter
• Bumped actions/checkout from v3 to v6 across all three workflow files

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
.github/workflows/release.yml	Updates to v2 of gh-extension-precompile with go.mod version detection, and checkout v6
.github/workflows/golangci-lint.yml	Updates checkout action to v6
.github/workflows/go.yml	Updates checkout action to v6

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