Remove unused import of loadTensor from shape.js

Author: ishii-norimi

lib/model/nns/onnx/operators/shape.js

@@ -1,5 +1,5 @@
 import { onnx } from '../onnx_importer.js'
-import { loadTensor, loadAttribute } from '../utils.js'
+import { loadAttribute } from '../utils.js'
 
 /**
  * Handle shape operator