Restore python-setup/check_python12.ps1

I think we can delete this logic too, but let's deal with that in a
separate PR

Author: RasmusWL

python-setup/check_python12.ps1

@@ -0,0 +1,19 @@
+
+#! /usr/bin/pwsh
+
+# If we are running greater than or equal to python 3.12, change py to run version 3.11
+Write-Host "Checking python version"
+if ((py -3 -c "import sys; print(0 if sys.version_info >= (3, 12) else 1)") -eq "0") {
+  Write-Host "python 3.12+ detected, setting PY_PYTHON3=3.11"
+  # First make sure we have python 3.11 installed
+  py -3.11 -c "import imp"
+  if ($LASTEXITCODE -eq 0) {
+    Write-Host "python 3.11 detected, using this version instead of 3.12+."
+    Write-Output "PY_PYTHON3=3.11" | Out-File -FilePath $Env:GITHUB_ENV -Encoding utf8 -Append
+  } else {
+    Write-Host "FAILURE: Python 3.12+ is not supported, and Python 3.11 could not be detected on the system. Please install Python 3.11."
+    exit 1
+  }
+} else {
+  Write-Host "python 3.12+ not detected, not making any changes."
+}