chore(deps): roll up supernode grpc dependabot bumps

[j-rafique]

No description provided.

[Copilot]

🟡 Changes recommended

The new govulncheck wrapper/workflow has a failure-mode where govulncheck/module errors can produce empty JSON and incorrectly pass, and the workflow invocation should not rely on executable file mode.

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Pull request overview

This PR rolls up a set of Go dependency updates (notably gRPC, OpenTelemetry, and golang.org/x/*) across the repo’s multiple Go modules, and tightens CI vulnerability scanning by introducing a govulncheck baseline wrapper that allowlists only explicitly reviewed, currently-unfixed reachable findings.

Changes:

• Bump Go module dependencies across root, cmd/sncli, sn-manager, and tests/system (including google.golang.org/grpc to v1.83.2 and multiple golang.org/x/* updates).
• Update go directives from 1.26.2 to 1.26.6 across modules.
• Add scripts/govulncheck-baseline.sh and switch the govulncheck workflow to use it.

File summaries

File	Description
go.mod	Bumps Go version and core deps (grpc, genproto, x/*).
go.sum	Updates checksums to match new root module dependency graph.
cmd/sncli/go.mod	Bumps sncli module deps (grpc, x/*, genproto).
cmd/sncli/go.sum	Updates checksums for sncli module dependency graph.
sn-manager/go.mod	Bumps sn-manager module deps (grpc, x/*, genproto).
sn-manager/go.sum	Updates checksums for sn-manager module dependency graph.
tests/system/go.mod	Bumps systemtests module deps (grpc, x/*, genproto).
tests/system/go.sum	Updates checksums for systemtests module dependency graph.
scripts/govulncheck-baseline.sh	New wrapper to enforce an actionable govulncheck baseline/allowlist policy.
.github/workflows/govulncheck.yml	Switches CI to run govulncheck via the new baseline wrapper across a module matrix.

Review details

• Files reviewed: 6/10 changed files
• Comments generated: 2
• Review effort level: Lite

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