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chore: add weekly Go dependency update workflow

Automate the process of keeping Go modules up to date to ensure the
project receives timely security patches and bug fixes.

- Runs every Monday at 00:00 UTC or via manual trigger.
- Executes `go get -u ./...` and `go mod tidy`.
- Generates a Pull Request containing a diff of the `go.mod` changes.
- Uses a GitHub App token to ensure subsequent CI checks are triggered
  on the created PR.

```mermaid
sequenceDiagram
    participant W as Workflow (GitHub Actions)
    participant G as Go Toolchain
    participant R as Repository (PR)
    W->>G: go get -u ./...
    W->>G: go mod tidy
    G-->>W: Updated go.mod & go.sum
    W->>R: Create Pull Request with changes
```