docs(price-service-client): add deprecation notice (#3119)

- Add deprecation notice to README recommending @pythnetwork/hermes-client
- Add deprecated field to package.json
- Bump version to 1.9.1

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: Tejas Badadare <[email protected]>

Author: devin-ai-integration[bot]

price_service/client/js/README.md

@@ -1,3 +1,7 @@
+> **⚠️ DEPRECATION NOTICE**
+>
+> This package is deprecated and is no longer maintained. Please use [@pythnetwork/hermes-client](https://www.npmjs.com/package/@pythnetwork/hermes-client) instead.
+
 # Price Service Client
 
 [Pyth Network](https://pyth.network/) provides real-time pricing data in a variety of asset classes, including cryptocurrency, equities, FX and commodities.

price_service/client/js/package.json

@@ -1,7 +1,8 @@
 {
   "name": "@pythnetwork/price-service-client",
-  "version": "1.9.0",
+  "version": "1.9.1",
   "description": "Pyth price service client",
+  "deprecated": "This package is deprecated and is no longer maintained. Please use @pythnetwork/hermes-client instead.",
   "author": {
     "name": "Pyth Data Association"
   },