Merge pull request #523 from textpattern/dependabot/npm_and_yarn/fibers-5.0.3

Bump fibers from 5.0.1 to 5.0.3

Author: philwareham

package.json

@@ -37,7 +37,7 @@
     "textpattern-branding": "0.3.3"
   },
   "optionalDependencies": {
-    "fibers": "5.0.1"
+    "fibers": "5.0.3"
   },
   "browserslist": [
     "> 0.5%",