Constrain numpy in tests (#1203)

### Summary Numpy released a new version which has caused our tests to fail. See here for example in Terra: Qiskit/qiskit#10305 ### Details and comments This PR constrains the version of numpy in the tests. We will need to Qiskit to align with the new numpy.
qiskit-community · Jun 19, 2023 · feff85c · feff85c
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commit feff85c
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diff --git a/constraints.txt b/constraints.txt
@@ -0,0 +1,4 @@
+# Numpy 1.25 deprecated some behaviours that we used, and caused some
+# tests to flake. See https://github.com/Qiskit/qiskit-terra/issues/10305,
+# remove pin when resolving that.
+numpy<1.25
diff --git a/tox.ini b/tox.ini
@@ -5,7 +5,7 @@ isolated_build = true
 
 [testenv]
 usedevelop = True
-install_command = pip install -U {opts} {packages}
+install_command = pip install -c{toxinidir}/constraints.txt -U {opts} {packages}
 setenv =
   VIRTUAL_ENV={envdir}
   QISKIT_SUPPRESS_PACKAGING_WARNINGS=Y