Bump the submodules group with 2 updates

Bumps the submodules group with 2 updates: [extern/mqt-core](https://github.com/cda-tum/mqt-core) and [extern/LogicBlocks](https://github.com/cda-tum/LogicBlocks).


Updates `extern/mqt-core` from `d9ed9b7` to `8b6e1bf`
- [Release notes](https://github.com/cda-tum/mqt-core/releases)
- [Commits](cda-tum/mqt-core@d9ed9b7...8b6e1bf)

Updates `extern/LogicBlocks` from `4bb726b` to `67c3bca`
- [Release notes](https://github.com/cda-tum/LogicBlocks/releases)
- [Commits](cda-tum/LogicBlocks@4bb726b...67c3bca)

---
updated-dependencies:
- dependency-name: extern/mqt-core
  dependency-type: direct:production
  dependency-group: submodules
- dependency-name: extern/LogicBlocks
  dependency-type: direct:production
  dependency-group: submodules
...

Signed-off-by: dependabot[bot] <support@github.com>