fix: deprecated symbol stripping does not strip out heritage clause w…

…ith imported type

When a non-deprecated class or interface inherits a deprecated class or
interface, the `--strip-deprecated` option does not strip out the
heritage clause.

This particularly affects cases where the inherited class or interface
is non-local, i.e., imported from another file.

packages/jsii/lib/transforms/deprecated-remover.ts

@@ -591,7 +591,8 @@ class Transformation {
     const symbol = typeChecker.getSymbolAtLocation(
       ts.getNameOfDeclaration(node as ts.Declaration) ?? node,
     );
-    return symbol && typeChecker.getFullyQualifiedName(symbol);
+    const type = symbol && typeChecker.getDeclaredTypeOfSymbol(symbol);
+    return type?.symbol && typeChecker.getFullyQualifiedName(type.symbol);
   }
 
   private static typeReference(