Add release note

Qiskit · Oct 26, 2023 · a868032 · a868032
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+---
+other:
+  - |
+    The :class:`.VF2Layout` and :class:`.VF2PostLayout` transpiler passes previously would
+    potentially run their internal scoring using multithreading if the input
+    circuit's were sufficiently large. However, the multithreading usage has
+    been removed from the passes as it was shown to cause a performance
+    regression instead of an improvement like originally intended.