build(deps): bump mongodb from 6.18.0 to 6.20.0

Bumps [mongodb](https://github.com/mongodb/node-mongodb-native) from 6.18.0 to 6.20.0.
- [Release notes](https://github.com/mongodb/node-mongodb-native/releases)
- [Changelog](https://github.com/mongodb/node-mongodb-native/blob/main/HISTORY.md)
- [Commits](mongodb/node-mongodb-native@v6.18.0...v6.20.0)

---
updated-dependencies:
- dependency-name: mongodb
  dependency-version: 6.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

packages/apps/session-storage/shopify-app-session-storage-mongodb/package.json

@@ -44,7 +44,7 @@
     "session storage"
   ],
   "dependencies": {
-    "mongodb": "^6.17.0"
+    "mongodb": "^6.20.0"
   },
   "peerDependencies": {
     "@shopify/shopify-api": "^12.0.0",