Update dependency canvas to v2.11.2

Author: renovate[bot]

package.json

@@ -81,7 +81,7 @@
     "babel-loader": "8.3.0",
     "babel-preset-minify": "0.6.0-alpha.9",
     "bufferutil": "4.0.6",
-    "canvas": "2.10.2",
+    "canvas": "2.11.2",
     "classnames": "2.3.2",
     "codecov": "3.8.3",
     "css-loader": "6.7.2",