chore(github): desired-behavior field should be textarea (#2201) [skip ci]

.github/ISSUE_TEMPLATE/enhancement.yml

@@ -15,7 +15,7 @@ body:
       description: Is your feature request related to a problem? If so, please provide a clear and concise description of the problem; e.g., "I'm always frustrated when [...]."
     validations:
       required: true
-  - type: input
+  - type: textarea
     id: desired-behavior
     attributes:
       label: Desired Behavior