build(deps): bump @agoric/notifier

Bumps [@agoric/notifier](https://github.com/Agoric/agoric-sdk) from 0.6.3-dev-b8d6697.0 to 0.6.3-u11.0.
- [Release notes](https://github.com/Agoric/agoric-sdk/releases)
- [Changelog](https://github.com/Agoric/agoric-sdk/blob/master/CHANGELOG.md)
- [Commits](https://github.com/Agoric/agoric-sdk/commits/@agoric/notifier@0.6.3-u11.0)

---
updated-dependencies:
- dependency-name: "@agoric/notifier"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]