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chore: add automated Go dependency update workflow

Introduce a weekly GitHub Action to keep Go modules up to date. This
automation ensures dependencies stay current by running `go get -u`
and creating a pull request with the resulting changes.

```mermaid
sequenceDiagram
    participant GH as GitHub Actions
    participant G as Go Modules
    participant PR as Pull Request

    GH->>G: go get -u ./...
    GH->>G: go mod tidy
    GH->>PR: Create/Update PR with changes
```