Modify .NET version options in BC issue template (#51392)

Updated .NET version options for breaking change template.

Author: gewarren

.github/ISSUE_TEMPLATE/02-breaking-change.yml

@@ -23,14 +23,17 @@ body:
       options:
         - .NET 8
         - .NET 9
-        - .NET 10 RC 1
-        - .NET 10 RC 2
-        - .NET 10 GA
+        - .NET 10
         - .NET 11 Preview 1
         - .NET 11 Preview 2
         - .NET 11 Preview 3
         - .NET 11 Preview 4
         - .NET 11 Preview 5
+        - .NET 11 Preview 6
+        - .NET 11 Preview 7
+        - .NET 11 RC 1
+        - .NET 11 RC 2
+        - .NET 11 GA
         - Other (please put exact version in description textbox)
     validations:
       required: true