[dependabot:release-train-updater] Review-ready dependency bundle: grpc v1.83.1 → v1.83.2 for github/gh-aw-mcpg

A review bundle has been published (artifact `grpc-1.83.2`) for the target repository `github/gh-aw-mcpg` (review mode — no PR was opened there directly).

### Summary
- Package: `google.golang.org/grpc` (Go, indirect/transitive dependency)
- Manifests: `go.mod`, `go.sum`
- Version: v1.83.1 → v1.83.2 (patch)
- Reason: routine freshness pass; this was the only low-risk, non-major update available among direct/indirect deps after running `go list -m -u all`.
- Reachability: transitive only, via the OTel OTLP gRPC exporter dependency graph. No direct import of grpc found in first-party source.

### Validation performed (in sandbox against `target/` checkout)
- `go get google.golang.org/grpc@v1.83.2 && go mod tidy`
- `go build ./...` — success
- `go test ./...` — all 14 packages passed
- `govulncheck ./...` — "No vulnerabilities found" (before and after)

Risk: low · Confidence: high · Merge candidate: yes (non-major, clean resolution, tests pass)

### Why an issue instead of a live PR
This workflow is running in `review` safe-output mode for this correlation; live PR creation against `github/gh-aw-mcpg` is not authorized in this mode. The full diff, changed-file list, and validation log are attached in the published review-bundle artifact for a maintainer to apply directly (`go get google.golang.org/grpc@v1.83.2 && go mod tidy`).

### Control Plane
- Correlation ID: 33807769868-57
- Central repo: githubnext/gh-aw-cao
- Run URL: https://github.com/githubnext/gh-aw-cao/actions/runs/33807769868

> Generated by [:dependabot: Dependabot / Release Trains](https://github.com/githubnext/gh-aw-cao/actions/runs/33807769868) · copilot · auto · 57.9 AIC · ⌖ 10.8 AIC · ⊞ 20.3K · [◷](https://github.com/search?q=repo%3Agithubnext%2Fgh-aw-cao+is%3Aissue+%22gh-aw-workflow-call-id%3A+githubnext%2Fgh-aw-cao%2Fdependabot-release-train-updater%22&type=issues)
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```

> - [x] expires on Sep 17, 2026, 9:34 PM UTC

Inspect the published review-bundle artifact and the target repository's go.mod and go.sum. Apply the stated grpc v1.83.2 update with go get and go mod tidy, then run go build ./..., go test ./..., and govulncheck ./.... Done means the dependency resolves cleanly and the listed validation passes.

Written by the indexing model from the issue text.