fix(bigbot-example): add missing dotenv dependency (#4064)

Co-authored-by: Fleny <Fleny113@outlook.com>

examples/bigbot/package.json

@@ -24,6 +24,7 @@
     "@influxdata/influxdb-client": "^1.33.2",
     "amqplib": "^0.10.4",
     "chalk": "^5.3.0",
+    "dotenv": "^16.4.7",
     "fastify": "^5.1.0"
   },
   "devDependencies": {

examples/bigbot/yarn.lock

@@ -850,6 +850,7 @@ __metadata:
     "@types/node": "npm:^22.9.0"
     amqplib: "npm:^0.10.4"
     chalk: "npm:^5.3.0"
+    dotenv: "npm:^16.4.7"
     fastify: "npm:^5.1.0"
     typescript: "npm:^5.6.3"
   languageName: unknown
@@ -883,6 +884,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"dotenv@npm:^16.4.7":
+  version: 16.4.7
+  resolution: "dotenv@npm:16.4.7"
+  checksum: f13bfe97db88f0df4ec505eeffb8925ec51f2d56a3d0b6d916964d8b4af494e6fb1633ba5d09089b552e77ab2a25de58d70259b2c5ed45ec148221835fc99a0c
+  languageName: node
+  linkType: hard
+
 "eastasianwidth@npm:^0.2.0":
   version: 0.2.0
   resolution: "eastasianwidth@npm:0.2.0"