chore: update verifier and vultiserver dependencies to latest versions

[johnnyluo]

Summary by CodeRabbit

• Chores
  • Updated core backend dependencies to their latest versions.
  • Improves stability and performance under high load and reduces edge‑case failures.
  • Enhances compatibility with newer environments and upstream services.
  • No user action required; existing workflows remain unchanged.

[Copilot]

Pull Request Overview

This PR updates two internal dependencies to their latest versions: the verifier and vultiserver packages from the vultisig organization.

• Updates verifier dependency from August 20th to August 25th version
• Updates vultiserver dependency from July 15th to August 25th version

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Walkthrough

Updated two Go module dependencies in go.mod to newer pseudo-versions for github.com/vultisig/verifier and github.com/vultisig/vultiserver. No other module entries or directives were changed.

Changes

Cohort / File(s)	Change summary
Dependency version bumps go.mod	Updated github.com/vultisig/verifier from v0.0.0-20250820091538-a29a985cae1d to v0.0.0-20250825065505-96fc04bb8d02; updated github.com/vultisig/vultiserver from v0.0.0-20250715212748-4b23f9849e4b to v0.0.0-20250825042420-c6e6ac281110.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

A hare taps go.mod with gentle care,
Two carrots bumped—verifier and server pair.
No files hop wild, no forests rearranged,
Just fresher trails where versions changed.
Thump-thump! Onward through the build we go 🥕✨

✨ Finishing Touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch update-verifier-dependencies

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