Fix CI: update Go version and GitHub Actions to current versions

[renecannao]

Summary

• Update Go version from 1.16 to 1.25.7 across all three workflow files
• Bump actions/checkout from v2 to v4
• Bump actions/setup-go from v1 to v5
• Bump actions/upload-artifact from v1 to v4 (in main.yml)
• Update orchestrator-ci-env clone URL from openark to percona (in system.yml)
• Rename step "Set up Go 1.16" to "Set up Go" in all workflows

Test plan

• CI workflows trigger and pass on this PR
• Verify no remaining references to @v1, @v2, or go-version: 1.16 in workflow files

Closes #5

[gemini-code-assist]

Note

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: e175ee1a-b4a7-4faa-bf9b-e0cdd010b87b

📥 Commits

Reviewing files that changed from the base of the PR and between 9e99dd6 and 58cb36f.

📒 Files selected for processing (3)

• .github/workflows/main.yml
• .github/workflows/system.yml
• .github/workflows/upgrade.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch task5-fix-ci

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[Copilot]

Pull request overview

Updates GitHub Actions workflows to align CI with the Go version declared in go.mod and modern supported major versions of common GitHub Actions.

Changes:

• Bump workflow Go toolchain from 1.16 to 1.25.7 via actions/setup-go@v5.
• Update actions/checkout to @v4 across workflows and actions/upload-artifact to @v4 in main.yml.
• Switch orchestrator-ci-env clone URL from openark to percona in system.yml.

Reviewed changes

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

File	Description
.github/workflows/main.yml	Updates checkout/setup-go/upload-artifact versions and Go toolchain version used in CI.
.github/workflows/system.yml	Updates checkout/setup-go versions, Go toolchain version, and orchestrator-ci-env repo URL.
.github/workflows/upgrade.yml	Updates checkout/setup-go versions and Go toolchain version for upgrade workflow.

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[Copilot]

The steps: list items are indented at the same level as steps: (e.g., - uses: actions/checkout@v4). YAML requires the sequence items to be indented under steps:; as written this workflow is likely invalid and will fail to parse in GitHub Actions. Please indent all step entries (and their nested keys) consistently under steps:.

[Copilot]

The steps: entries are not indented under steps: (the - name: line starts at the same indentation level as steps:). This makes the YAML structure invalid and will likely prevent the workflow from running. Please indent the entire steps sequence (and nested keys) under steps:.

[Copilot]

The steps: list items are aligned with steps: instead of being indented beneath it. GitHub Actions workflows are strict YAML; this indentation is likely to make the workflow fail to load. Please indent all - name: / - uses: items (and their nested keys) under steps:.