Use Get-WmiObject instead of wmic for counting cores on windows

wmic is disabled by default on new versions of windows.
See https://techcommunity.microsoft.com/blog/windows-itpro-blog/wmi-command-line-wmic-utility-deprecation-next-steps/4039242

loky/backend/context.py

@@ -254,18 +254,32 @@ def _count_physical_cores():
             cpu_info = {line for line in cpu_info if not line.startswith("#")}
             cpu_count_physical = len(cpu_info)
         elif sys.platform == "win32":
-            cpu_info = subprocess.run(
-                "wmic CPU Get NumberOfCores /Format:csv".split(),
-                capture_output=True,
-                text=True,
-            )
-            cpu_info = cpu_info.stdout.splitlines()
-            cpu_info = [
-                l.split(",")[1]
-                for l in cpu_info
-                if (l and l != "Node,NumberOfCores")
-            ]
-            cpu_count_physical = sum(map(int, cpu_info))
+            try:
+                cpu_info = subprocess.run(
+                    "wmic CPU Get NumberOfCores /Format:csv".split(),
+                    capture_output=True,
+                    text=True,
+                )
+            except FileNotFoundError:
+                cpu_info = subprocess.run(
+                    (
+                        "powershell Get-WmiObject "
+                        "-Class 'win32_processor' -Property 'numberOfCores' | "
+                        "Select-Object -ExpandProperty 'numberOfCores'"
+                    ).split(),
+                    capture_output=True,
+                    text=True,
+                )
+                cpu_info = cpu_info.stdout.splitlines()
+                cpu_count_physical = int(cpu_info[0])
+            else:
+                cpu_info = cpu_info.stdout.splitlines()
+                cpu_info = [
+                    l.split(",")[1]
+                    for l in cpu_info
+                    if (l and l != "Node,NumberOfCores")
+                ]
+                cpu_count_physical = sum(map(int, cpu_info))
         elif sys.platform == "darwin":
             cpu_info = subprocess.run(
                 "sysctl -n hw.physicalcpu".split(),