ci: Windows runners switched which python version they had (#5010)

Yay, I love how these things just break with no notice.

Fixes CI that broke a couple days agi.

---------

Signed-off-by: Larry Gritz <lg@larrygritz.com>

Author: lgritz

.github/workflows/ci.yml

@@ -695,13 +695,13 @@ jobs:
             nametag: windows-2022
             vsver: 2022
             generator: "Visual Studio 17 2022"
-            python_ver: "3.9"
+            python_ver: "3.12"
             setenvs: export OPENIMAGEIO_PYTHON_LOAD_DLLS_FROM_PATH=1
           - desc: Windows-2025 VS2022
             runner: windows-2025
             nametag: windows-2025
             vsver: 2022
             generator: "Visual Studio 17 2022"
-            python_ver: "3.9"
+            python_ver: "3.12"
             setenvs: export OPENIMAGEIO_PYTHON_LOAD_DLLS_FROM_PATH=1
             benchmark: 1

src/build-scripts/gh-win-installdeps.bash

@@ -32,6 +32,10 @@ elif [[ "$PYTHON_VERSION" == "3.9" ]] ; then
     export CMAKE_PREFIX_PATH="$CMAKE_PREFIX_PATH;/c/hostedtoolcache/windows/Python/3.9.13/x64"
     export Python_EXECUTABLE="/c/hostedtoolcache/windows/Python/3.9.13/x64/python3.exe"
     export PYTHONPATH=$OpenImageIO_ROOT/lib/python${PYTHON_VERSION}/site-packages
+elif [[ "$PYTHON_VERSION" == "3.12" ]] ; then
+    export CMAKE_PREFIX_PATH="$CMAKE_PREFIX_PATH;/c/hostedtoolcache/windows/Python/3.12.10/x64"
+    export Python_EXECUTABLE="/c/hostedtoolcache/windows/Python/3.12.10/x64/python3.exe"
+    export PYTHONPATH=$OpenImageIO_ROOT/lib/python${PYTHON_VERSION}/site-packages
 fi
 pip install numpy
 

src/cmake/testing.cmake

@@ -110,6 +110,7 @@ macro (oiio_add_tests)
                              "OIIO_TESTSUITE_ROOT=${_testsuite}"
                              "OIIO_TESTSUITE_SRC=${_testsrcdir}"
                              "OIIO_TESTSUITE_CUR=${_testdir}"
+                             "Python_EXECUTABLE=${Python3_EXECUTABLE}"
                              ${_ats_ENVIRONMENT})
             if (NOT ${_ats_testdir} STREQUAL "")
                 set_property(TEST ${_testname} APPEND PROPERTY ENVIRONMENT

testsuite/runtest.py

@@ -162,9 +162,7 @@ def newsymlink(src: str, dst: str):
 if os.getenv("Python_EXECUTABLE") :
     pythonbin = os.getenv("Python_EXECUTABLE")
 else :
-    pythonbin = 'python'
-    if os.getenv("PYTHON_VERSION") :
-        pythonbin += os.getenv("PYTHON_VERSION")
+    pythonbin = sys.executable
 #print ("pythonbin = ", pythonbin)