chore: bump gl dependency to 6.0.2, fixing npm install for node 18 and potentially MacOS

no visual regressions
https://github.com/stackgl/headless-gl/releases

https://github.com/opensheetmusicdisplay/opensheetmusicdisplay/issues/1239

package.json

@@ -140,7 +140,7 @@
     "@types/uuid": "^3.4.3"
   },
   "optionalDependencies": {
-    "gl": "^5.0.0"
+    "gl": "^6.0.2"
   },
   "config": {
     "commitizen": {