Narrow typescript range: they don't use semver

Author: justinfagnani

package.json

@@ -44,7 +44,7 @@
     "rollup-plugin-babel": "^3.0.7",
     "rollup-plugin-commonjs": "^9.2.0",
     "rollup-plugin-license": "^0.8.1",
-    "typescript": "^4.8.3",
+    "typescript": "~4.8.3",
     "wct-browser-legacy": "^1.0.2",
     "web-component-tester": "^6.9.2"
   },