Build with latest numpy on Windows and test with oldest supported numpy

ci/win_install_deps.cmd

@@ -23,11 +23,11 @@ pwsh -command "(Get-Content C:\Python310\Lib\distutils\cygwinccompiler.py) -repl
 pwsh -command "(Get-Content C:\Python311\Lib\distutils\cygwinccompiler.py) -replace 'msvcr100', 'msvcrt' | Out-File C:\Python311\Lib\distutils\cygwinccompiler.py"
 
 :: install numpy
-C:\Python38\python.exe -m pip install  numpy==1.17.5 "cython" || goto :error
-C:\Python39\python.exe -m pip install  numpy==1.19.3 "cython" || goto :error
-C:\Python310\python.exe -m pip install numpy==1.21.3 "cython" || goto :error
-C:\Python311\python.exe -m pip install numpy==1.23.5 "cython" || goto :error
-C:\Python312\python.exe -m pip install numpy==1.26.3 "cython" || goto :error
+C:\Python38\python.exe -m pip install  numpy cython || goto :error
+C:\Python39\python.exe -m pip install  numpy cython || goto :error
+C:\Python310\python.exe -m pip install numpy cython || goto :error
+C:\Python311\python.exe -m pip install numpy cython || goto :error
+C:\Python312\python.exe -m pip install numpy cython || goto :error
 :: setuptools 70.2 leads to an error
 C:\Python312\python.exe -m pip install setuptools==70.1.1 || goto :error
 

ci/win_test_installer.cmd

@@ -16,13 +16,19 @@ echo %NEURONHOME%
 :: If so, try again to generate it. No wait required like previous strategies, we rely on testing entropy from this point on.
 if not exist association.hoc.out (start /wait /REALTIME %cd%\ci\association.hoc)
 
+:: install oldest supported numpy
+C:\Python38\python.exe -m pip install numpy==1.19.5 || goto :error
+C:\Python39\python.exe -m pip install numpy==1.19.5 || goto :error
+C:\Python310\python.exe -m pip install numpy==1.21.6 || goto :error
+C:\Python311\python.exe -m pip install numpy==1.23.5 || goto :error
+C:\Python312\python.exe -m pip install numpy==1.26.4 || goto :error
+
 :: test all pythons
 C:\Python38\python -c "import neuron; neuron.test(); quit()" || set "errorfound=y"
 C:\Python39\python -c "import neuron; neuron.test(); quit()" || set "errorfound=y"
 C:\Python310\python -c "import neuron; neuron.test(); quit()" || set "errorfound=y"
 C:\Python311\python -c "import neuron; neuron.test(); quit()" || set "errorfound=y"
-:: install numpy dependency
-python -m pip install "numpy"
+C:\Python312\python -c "import neuron; neuron.test(); quit()" || set "errorfound=y"
 :: run also using whatever is system python
 python --version
 python -c "import neuron; neuron.test(); quit()" || set "errorfound=y"