fix: packages/email-server/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-TAR-6476909

Author: snyk-bot

packages/email-server/package.json

@@ -36,7 +36,7 @@
     "async": "^3.2.4",
     "axios": "^0.27.2",
     "bufferutil": "^4.0.7",
-    "canvas": "^2.10.2",
+    "canvas": "^3.0.0",
     "cron": "^2.1.0",
     "dotenv": "^16.0.3",
     "encoding": "^0.1.13",