feat: add sixth params of SourceMapSource in webpack-sources (#41503)

types/webpack-sources/index.d.ts

@@ -190,7 +190,8 @@ export class SourceMapSource extends Source implements SourceAndMapMixin {
         name: string,
         sourceMap: SourceMapGenerator | RawSourceMap,
         originalSource?: string,
-        innerSourceMap?: RawSourceMap
+        innerSourceMap?: RawSourceMap,
+        removeOriginalSource?: boolean,
     );
 
     source(): string;

types/webpack-sources/webpack-sources-tests.ts

@@ -25,3 +25,4 @@ const s5 = new LineToLineMappedSource('a', 'v', 'c');
 const s6 = new PrefixSource(s4, s5);
 const s7 = new ReplaceSource(s3, 'ha');
 const s8 = new SourceMapSource('va', 'vb', a, 'vc', b);
+const s9 = new SourceMapSource('va', 'vb', a, 'vc', b, true);