[ChartJs] Remove <3.9 boundary and fix testsuite

Author: evertharmeling

src/Chartjs/assets/package.json

@@ -26,7 +26,7 @@
     "devDependencies": {
         "@hotwired/stimulus": "^3.0.0",
         "@types/chart.js": "^2.9.34",
-        "chart.js": "^3.4.1 <3.9 || ^4.0",
+        "chart.js": "^3.4.1 || ^4.0",
         "resize-observer-polyfill": "^1.5.1",
         "vitest-canvas-mock": "^0.3.3"
     }