chore: bump ext-apps to 1.7.3 (#680)

No SDK API changes since 1.7.2.

Examples:
- Add lazy-auth-server example (#679)
- Publish lazy-auth-server to npm (added to publish workflows)

Also syncs example dependency ranges to ^1.7.0 (output of npm run bump).

examples/basic-host/package.json

@@ -1,7 +1,7 @@
 {
   "homepage": "https://github.com/modelcontextprotocol/ext-apps/tree/main/examples/basic-host",
   "name": "@modelcontextprotocol/ext-apps-basic-host",
-  "version": "1.7.2",
+  "version": "1.7.3",
   "type": "module",
   "scripts": {
     "build": "tsc --noEmit && concurrently \"cross-env INPUT=index.html vite build\" \"cross-env INPUT=sandbox.html vite build\"",
@@ -11,7 +11,7 @@
     "dev": "cross-env NODE_ENV=development concurrently \"npm run watch\" \"npm run serve\""
   },
   "dependencies": {
-    "@modelcontextprotocol/ext-apps": "^1.0.0",
+    "@modelcontextprotocol/ext-apps": "^1.7.0",
     "@modelcontextprotocol/sdk": "^1.29.0",
     "react": "^19.2.0",
     "react-dom": "^19.2.0",