Bump the blocknote group in /frontend with 3 updates

Bumps the blocknote group in /frontend with 3 updates: [@blocknote/core](https://github.com/TypeCellOS/BlockNote/tree/HEAD/packages/core), [@blocknote/mantine](https://github.com/TypeCellOS/BlockNote/tree/HEAD/packages/mantine) and [@blocknote/react](https://github.com/TypeCellOS/BlockNote/tree/HEAD/packages/react).


Updates `@blocknote/core` from 0.38.0 to 0.39.0
- [Release notes](https://github.com/TypeCellOS/BlockNote/releases)
- [Changelog](https://github.com/TypeCellOS/BlockNote/blob/main/CHANGELOG.md)
- [Commits](https://github.com/TypeCellOS/BlockNote/commits/v0.39.0/packages/core)

Updates `@blocknote/mantine` from 0.38.0 to 0.39.0
- [Release notes](https://github.com/TypeCellOS/BlockNote/releases)
- [Changelog](https://github.com/TypeCellOS/BlockNote/blob/main/CHANGELOG.md)
- [Commits](https://github.com/TypeCellOS/BlockNote/commits/v0.39.0/packages/mantine)

Updates `@blocknote/react` from 0.38.0 to 0.39.0
- [Release notes](https://github.com/TypeCellOS/BlockNote/releases)
- [Changelog](https://github.com/TypeCellOS/BlockNote/blob/main/CHANGELOG.md)
- [Commits](https://github.com/TypeCellOS/BlockNote/commits/v0.39.0/packages/react)

---
updated-dependencies:
- dependency-name: "@blocknote/core"
  dependency-version: 0.39.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: blocknote
- dependency-name: "@blocknote/mantine"
  dependency-version: 0.39.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: blocknote
- dependency-name: "@blocknote/react"
  dependency-version: 0.39.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: blocknote
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]