Relax CI pin on Numpy < 1.25

The release of Numpy 1.26.1 included an upstream patch to fix a bug in
the compiled SIMD versions of complex multiplication loops on macOS, and
we have fixed the deprecation warnings and new CI flakiness on our
side caused by it, so it should now be safe to relax the pin.

constraints.txt

@@ -2,11 +2,6 @@
 # 4.0+. The pin can be removed after nbformat is updated.
 jsonschema==3.2.0
 
-# Numpy 1.25 deprecated some behaviours that we used, and caused the isometry
-# tests to flake. See https://github.com/Qiskit/qiskit-terra/issues/10305,
-# remove pin when resolving that.
-numpy<1.25; python_version<'3.12'
-
 # Scipy 1.11 seems to have caused an instability in the Weyl coordinates
 # eigensystem code for one of the test cases.  See
 # https://github.com/Qiskit/qiskit-terra/issues/10345 for current details.