fix(types): add referrerPolicy to ImgHTMLAttributes (#6694)

Mirror the existing declarations on AnchorHTMLAttributes and
IframeHTMLAttributes so <img referrerpolicy="..."> type-checks
without an `as any` cast. The ReferrerPolicy type is provided
by the TypeScript DOM lib; no runtime impact.

fixes: #6692

Author: civing

src/declarations/stencil-public-runtime.ts

@@ -1206,6 +1206,7 @@ export namespace JSXBase {
     importance?: 'low' | 'auto' | 'high';
     height?: number | string;
     loading?: 'lazy' | 'auto' | 'eager';
+    referrerPolicy?: ReferrerPolicy;
     sizes?: string;
     src?: string;
     srcSet?: string;