fix: resolve google.golang.org/grpc vulnerabilities

[bb111189]

Summary

This PR resolves the critical google.golang.org/grpc vulnerability in blitz.

Changes

• Updated google.golang.org/grpc from v1.74.2 to v1.79.3 in go.mod
• Added matching go.sum entries with go mod download
• Used the manual Go module update flow because go mod tidy is blocked by upstream dependency resolution errors in babylonlabs-io/finality-gadget

Security Impact

• Fixes Dependabot alert fix: resolve google.golang.org/grpc vulnerabilities #112
• Alerts fix: patch minimatch to >=10.2.3 #111 and fix: patch security vulnerabilities #110 remain open because the current tagged releases for github.com/jackc/pgproto3/v2 and github.com/shamaton/msgpack/v2 are still within the vulnerable ranges
• Alerts chore(deps): bump golang.org/x/oauth2 from 0.24.0 to 0.27.0 #86 and feat: fix cache and delete useless call #85 remain open because github.com/babylonlabs-io/babylon/v3 has no official patched release available
• Alert feat: upgrade contracts for new bsn rollup contract #88 remains open because elliptic has no official patch available

Verification

• go mod download google.golang.org/grpc@v1.79.3 succeeds
• go mod tidy remains blocked by upstream revision github.com/babylonlabs-io/finality-gadget@6d5e98aba949