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/say-server/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@modelcontextprotocol/server-say",
-  "version": "1.7.2",
+  "version": "1.7.3",
   "private": true,
   "description": "Streaming TTS MCP App Server with karaoke-style text highlighting",
   "repository": {
@@ -15,7 +15,7 @@
     "build": "echo 'No build step needed for Python server'"
   },
   "dependencies": {
-    "@modelcontextprotocol/ext-apps": "^1.0.0",
+    "@modelcontextprotocol/ext-apps": "^1.7.0",
     "@modelcontextprotocol/sdk": "^1.29.0"
   }
 }