chore: remove unused ml-array-variance

Author: EscapedGibbon

package.json

@@ -51,7 +51,6 @@
     "image-type": "^4.1.0",
     "jpeg-js": "^0.4.4",
     "median-quickselect": "^1.0.1",
-    "ml-array-variance": "^1.1.8",
     "ml-convolution": "^2.0.0",
     "ml-matrix": "^6.10.4",
     "ml-regression-multivariate-linear": "^2.0.4",