Bump extern/mqt-core from 87f97a3 to a392c48

Bumps [extern/mqt-core](https://github.com/cda-tum/mqt-core) from `87f97a3` to `a392c48`.
- [Release notes](https://github.com/cda-tum/mqt-core/releases)
- [Commits](cda-tum/mqt-core@87f97a3...a392c48)

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

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