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chore: add automated Go dependency updates

Introduces a weekly GitHub Actions workflow to keep Go modules up to
date.

- Runs every Monday at 00:00 UTC.
- Automatically generates a pull request with dependency changes.
- Uses a GitHub App token for secure PR creation and commits.

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

    GH->>Go: go get -u ./...
    GH->>Go: go mod tidy
    GH->>PR: Create/Update chore/update-go-deps
```