.Net: Remove potential ambituity for Step05 Processes Sample (#10013)

### Motivation and Context
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Fixes: #9998

### Description
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Use a less ambitious pattern for anyone who may have an particularly
sensitive development environment.

### Contribution Checklist
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- [X ] The code builds clean without any errors or warnings
- [X] The PR follows the [SK Contribution
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raises no violations
- [X] All unit tests pass, and I have added new tests where possible
- [X] I didn't break anyone 😄

dotnet/samples/GettingStartedWithProcesses/Step05/Step05_MapReduce.cs

@@ -116,7 +116,7 @@ public async ValueTask ComputeAsync(KernelProcessStepContext context, string chu
         {
             Dictionary<string, int> counts = [];
 
-            string[] words = chunk.Split([' ', '\n', '\r', '.', ',', '’'], StringSplitOptions.RemoveEmptyEntries);
+            string[] words = chunk.Split([" ", "\n", "\r", ".", ",", "’"], StringSplitOptions.RemoveEmptyEntries);
             foreach (string word in words)
             {
                 if (s_notInteresting.Contains(word))