Update breaking-change.yaml

Author: gewarren

.github/ISSUE_TEMPLATE/breaking-change.yaml

@@ -20,14 +20,14 @@ body:
       label: Version
       description: What version of .NET introduced the breaking change?
       options:
-        - .NET 8 GA
-        - .NET 9 RC 1
-        - .NET 9 RC 2
-        - .NET 9 GA
+        - .NET 8
+        - .NET 9
         - .NET 10 Preview 1
         - .NET 10 Preview 2
         - .NET 10 Preview 3
         - .NET 10 Preview 4
+        - .NET 10 Preview 5
+        - .NET 10 Preview 6
         - Other (please put exact version in description textbox)
     validations:
       required: true