Update .env.example

Added upstash config

Author: YOGESH-08

.env.example

@@ -27,3 +27,7 @@ KV_URL=""                           # The URL of your Vercel KV instance
 KV_REST_API_URL=""                  # The REST API URL of your Vercel KV instance
 KV_REST_API_TOKEN=""                # The REST API token for your Vercel KV instance
 KV_REST_API_READ_ONLY_TOKEN=""      # The read-only REST API token for your Vercel KV instance
+
+# Upstash_Redis
+UPSTASH_REDIS_REST_URL=""           # REST URL of your Upstash Redis database
+UPSTASH_REDIS_REST_TOKEN=""         # REST API token for Upstash Redis