Update dependency canvas to v2.11.0

Author: renovate[bot]

billing/google/package.json

@@ -77,7 +77,7 @@
     "babel-loader": "8.3.0",
     "babel-preset-minify": "0.6.0-alpha.9",
     "bufferutil": "4.0.7",
-    "canvas": "2.10.2",
+    "canvas": "2.11.0",
     "codecov": "3.8.3",
     "css-loader": "6.7.2",
     "enzyme": "3.11.0",