Bump gl version to v8 (#1732)

Author: sayomaki

package.json

@@ -48,7 +48,7 @@
     "source-map": "0.7.3"
   },
   "resolutions": {
-    "**/gl": "^6.0.2"
+    "**/gl": "^8.1.6"
   },
   "scripts": {
     "build": "yarn docs && yarn build:slang",