Add Connect IQ SDK v8.2.3

Author: pcolby

.github/workflows/build.yaml

@@ -111,6 +111,7 @@ jobs:
           # 8.2.0 Removed from Garmin's manifest (`sdks.json`), around 2025-06-20Z.
           - 8.2.1
           - 8.2.2
+          - 8.2.3
       fail-fast: false
 
   # This could be part of the pkg job above, but it uses elevated permissions, not required for the pkg steps.