Update action.yml

Author: kzu

.github/actions/dotnet/action.yml

@@ -9,6 +9,8 @@ runs:
       shell: bash
       run: |
         VERSIONS=$(gh api /repos/${{ github.repository }}/properties/values | jq -r '.[] | select(.property_name == "DOTNET") | .value')
+        # Remove extra whitespace from VERSIONS
+        VERSIONS=$(echo "$VERSIONS" | tr -s ' ' | tr -d ' ')
         # Convert comma-separated to newline-separated
         NEWLINE_VERSIONS=$(echo "$VERSIONS" | tr ',' '\n')
         # Validate versions