chore(build): standardize all package library targets to ES2023

packages/test-utils/tsconfig.json

@@ -2,7 +2,7 @@
   "extends": "../../tsconfig.json",
   "compilerOptions": {
     "outDir": "dist",
-    "lib": ["DOM", "DOM.Iterable", "ES2021"],
+    "lib": ["DOM", "DOM.Iterable", "ES2023"],
     "composite": true,
     "types": ["node"]
   },

packages/vscode-ide-companion/tsconfig.json

@@ -3,7 +3,7 @@
     "module": "NodeNext",
     "moduleResolution": "NodeNext",
     "target": "ES2022",
-    "lib": ["ES2022", "dom"],
+    "lib": ["ES2023", "dom"],
     "sourceMap": true,
     /*
      * skipLibCheck is necessary because the a2a-server package depends on