chore: upgrade grpc to 1.83.2 to resolve Dependabot alert

[himadrisingh]

Resolves one open Dependabot security alert:

• google.golang.org/grpc 1.82.1 → 1.83.2 — GHSA-vp52-pcj8-j9qc (high): heap memory exhaustion (OOM) via HTTP/2 DATA frame fragmentation

Split out from the other Dependabot upgrades because this bump cascades ~28 transitive upgrades via MVS, notably google.golang.org/api 0.230 → 0.264 and cloud.google.com/go/bigquery 1.66 → 1.72. The cascade is inherent to grpc 1.83.2's module graph, not an artifact of go mod tidy — I verified this by applying the bump in isolation. The BigQuery and GCS driver paths are worth extra attention in CI.

Verified go build ./... passes. Overlaps with #9874 on go.mod, so whichever merges second needs a rebase.

Checklist:

• Covered by tests
• Ran it and it works as intended
• Reviewed the diff before requesting a review
• Checked for unhandled edge cases
• Linked the issues it closes
• Checked if the docs need to be updated. If so, create a separate Linear DOCS issue
• Intend to cherry-pick into the release branch
• I'm proud of this work!

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Developed in collaboration with Claude Code

🤖 Generated with Claude Code

[nishantmonu51]

👍 , LGTM post CI failures are fixed.