Update Actions to install 1.x numpy.

Updating Actions depending on numpy install to use pre-2.0 numpy version
as is currently required for ngen builds.

.github/actions/ngen-build/action.yaml

@@ -144,7 +144,7 @@ runs:
             python3 -m venv .venv
             . .venv/bin/activate
             pip install pip
-            pip install numpy
+            pip install numpy<=2.0.0
             deactivate
           shell: bash