chore(deps): update actions/setup-go action to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/setup-go	action	major	v4 → v6

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Release Notes

actions/setup-go (actions/setup-go)

v6

Compare Source

v5

Compare Source

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Configuration

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[greptile-apps]

Greptile Overview

Greptile Summary

This PR updates the CI workflow to use actions/setup-go@v6 instead of @v4 while keeping the existing Go matrix (stable, oldstable) and test/style steps unchanged. The change is isolated to .github/workflows/ci.yml and simply affects how the Go toolchain is provisioned on the runner before running go test and gofmt checks.

Confidence Score: 5/5

• This PR is safe to merge with minimal risk.
• The diff is a single-line update to a pinned GitHub Action version in CI (actions/setup-go@v4 -> @v6) with no repository code changes. Workflow inputs and steps remain the same, so expected impact is limited to the Go setup action’s internal behavior.
• No files require special attention

Important Files Changed

Filename	Overview
.github/workflows/ci.yml	Bumps GitHub Actions actions/setup-go from v4 to v6 in CI workflow; no functional logic changes beyond action version.

Sequence Diagram

sequenceDiagram
  participant GH as GitHub
  participant WF as CI Workflow (.github/workflows/ci.yml)
  participant Runner as ubuntu-latest Runner
  participant Checkout as actions/checkout@v4
  participant SetupGo as actions/setup-go@v6
  participant Go as Go Toolchain

  GH->>WF: push to main / pull_request
  WF->>Runner: start job (matrix: stable, oldstable)
  Runner->>Checkout: checkout repository
  Checkout-->>Runner: workspace ready
  Runner->>SetupGo: install/configure Go (go-version: matrix.go)
  SetupGo-->>Runner: Go available on PATH
  Runner->>Go: go mod download
  Runner->>Go: go test -v ./...
  Runner->>Go: gofmt -d ./
  Runner->>GH: git diff --exit-code (style gate)

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