Remove dependency on win32ole

This will become bundled in Ruby 3.5

Unfortunately there is no portable way of checking for this.
The wmic command is deprecated, though I don't observe this myself on W11 (yet?)

lib/parallel.rb

@@ -328,11 +328,7 @@ def physical_processor_count
             end
             cores.count
           when /mswin|mingw/
-            require 'win32ole'
-            result_set = WIN32OLE.connect("winmgmts://").ExecQuery(
-              "select NumberOfCores from Win32_Processor"
-            )
-            result_set.to_enum.collect(&:NumberOfCores).reduce(:+)
+            physical_processor_count_windows
           else
             processor_count
           end
@@ -358,6 +354,33 @@ def worker_number=(worker_num)
 
     private
 
+    def physical_processor_count_windows
+      # Get-CimInstance introduced in PowerShell 3 or earlier: https://learn.microsoft.com/en-us/previous-versions/powershell/module/cimcmdlets/get-ciminstance?view=powershell-3.0
+      result = run(
+        'powershell -command "Get-CimInstance -ClassName Win32_Processor ' \
+        '| Select-Object -Property NumberOfCores"'
+      )
+      if !result || $?.exitstatus != 0
+        # fallback to deprecated wmic for older systems
+        result = run("wmic cpu get NumberOfCores")
+      end
+      if !result || $?.exitstatus != 0
+        # Bail out if both commands returned something unexpected
+        warn "guessing pyhsical processor count"
+        processor_count
+      else
+        # powershell: "\nNumberOfCores\n-------------\n            4\n\n\n"
+        # wmic:       "NumberOfCores  \n\n4              \n\n\n\n"
+        result.scan(/\d+/).map(&:to_i).reduce(:+)
+      end
+    end
+
+    def run(command)
+      IO.popen(command, &:read)
+    rescue Errno::ENOENT
+      # Ignore
+    end
+
     def add_progress_bar!(job_factory, options)
       if (progress_options = options[:progress])
         raise "Progressbar can only be used with array like items" if job_factory.size == Float::INFINITY