⬆️ Update cda-tum/mqt-core (#417)

This pull request updates the
[cda-tum/mqt-core](https://github.com/cda-tum/mqt-core) dependency from
cda-tum/mqt-core@78a8d6b (version
v2.5.2) to cda-tum/mqt-core@2a7a929
(version v2.6.0).

**Full Changelog**:
cda-tum/mqt-core@78a8d6b...2a7a929

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Co-authored-by: burgholzer <6358767+burgholzer@users.noreply.github.com>

cmake/ExternalDependencies.cmake

@@ -20,9 +20,9 @@ if(BUILD_MQT_DDSIM_BINDINGS)
 endif()
 
 # cmake-format: off
-set(MQT_CORE_VERSION 2.5.2
+set(MQT_CORE_VERSION 2.6.0
     CACHE STRING "MQT Core version")
-set(MQT_CORE_REV "78a8d6bbecf10a2e09b994eb6705fd5d19415065"
+set(MQT_CORE_REV "2a7a92951fb67d0c4e795afbd17449063aa42d20"
     CACHE STRING "MQT Core identifier (tag, branch or commit hash)")
 set(MQT_CORE_REPO_OWNER "cda-tum"
     CACHE STRING "MQT Core repository owner (change when using a fork)")