Lower numpy minimum version from 2.3.1 to 1.25.2 (#84)

The codebase only uses basic numpy APIs available since ~1.13. The
practical lower bound is 1.25.2, dictated by scipy>=1.16.0's own
numpy requirement and Python >=3.11 compatibility.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: ryanhill1

requirements.txt

@@ -2,5 +2,5 @@ qbraid>=0.11.0
 pyqasm>=0.5.0,<1.1.0
 sympy>=1.14.0
 scipy>=1.16.0
-numpy>=2.3.1
+numpy>=1.25.2
 networkx>=3.1.0