build(deps): bump github.com/nats-io/nats-server/v2

Bumps [github.com/nats-io/nats-server/v2](https://github.com/nats-io/nats-server) from 2.12.5 to 2.12.6.
- [Release notes](https://github.com/nats-io/nats-server/releases)
- [Changelog](https://github.com/nats-io/nats-server/blob/main/RELEASES.md)
- [Commits](https://github.com/nats-io/nats-server/compare/v2.12.5...v2.12.6)

---
updated-dependencies:
- dependency-name: github.com/nats-io/nats-server/v2
  dependency-version: 2.12.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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