chore: update vtk js to 26.4.0 (#3174)

extensions/cornerstone/package.json

@@ -47,7 +47,7 @@
     "@cornerstonejs/core": "0.30.1",
     "@cornerstonejs/streaming-image-volume-loader": "^0.11.2",
     "@cornerstonejs/tools": "0.39.0",
-    "@kitware/vtk.js": "25.9.0",
+    "@kitware/vtk.js": "26.4.0",
     "html2canvas": "^1.4.1",
     "lodash.debounce": "4.0.8",
     "lodash.merge": "^4.6.2",