build(deps): bump google.golang.org/grpc from 1.75.0 to 1.79.3

[vdemeester]

Changes

Bump gRPC-Go from v1.75.0 to v1.79.3 to fix CVE-2026-33186 (GHSA-p77j-4mvh-x3m3), a critical severity authorization bypass via missing leading slash in :path.

Also bump transitive dependencies to fix their CVEs:

• go-jose/v4 4.1.2 → 4.1.4 (GHSA-78h2-9frx-2jm8, JWE decryption panic, high)
• go.opentelemetry.io/otel 1.37.0 → 1.43.0 (GHSA-mh2q-q3fh-2475, baggage header DoS, high)

The otel bump raises the go directive to 1.25.0, which also fixes the golangci-lint compatibility issue on this release branch (superseding #10028).

The existing dependabot PR #9931 bumps grpc to v1.75.1, but that version is still affected by CVE-2026-33186. The fix landed in v1.79.3, so this PR goes directly there.

All unit tests pass and the build is clean.

Close #9931

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Release Notes

Bump gRPC-Go to v1.79.3 to fix CVE-2026-33186 (critical authorization bypass), go-jose/v4 to v4.1.4 and otel to v1.43.0 to fix additional CVEs

[tekton-robot]

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[vdemeester]

/retest

The lint failure is a false negative — the diff exceeds GitHub's 300-file limit so golangci-lint can't fetch the PR patch. Not a real code issue. The e2e failures are the usual flakes.