fix(server-ai): unpin peer depedency reference (#1788)

This PR will unpin the sdk-server-common package from the peer deps of
server-ai

The server common package seems to be only used for typing. I chose a
more conservative floor of 2.0.0 to match more versions. We will
reassess if there are any issues with this.

Author: joker23

packages/sdk/server-ai/package.json

@@ -60,6 +60,6 @@
     "typescript-eslint": "^8.0.0"
   },
   "peerDependencies": {
-    "@launchdarkly/js-server-sdk-common": "2.19.2"
+    "@launchdarkly/js-server-sdk-common": "^2.0.0"
   }
 }