Add droidcon London for android, networking, general

[confs-tech-bot]

Conference information

Website: https://london.droidcon.com

Twitter: https://twitter.com/@droidconLondon

// android, networking, general

{
  "name": "droidcon London",
  "url": "https://london.droidcon.com",
  "startDate": "2025-10-30",
  "endDate": "2025-10-31",
  "city": "London",
  "country": "U.K.",
  "online": false,
  "locales": "EN",
  "cocUrl": "https://london.droidcon.com/code-of-conduct/",
  "twitter": "@droidconLondon"
}

[github-actions]

Error: Found general conference with other stack: droidcon London

File: conferences/2025/android.json:18
File: conferences/2025/general.json:468
File: conferences/2025/networking.json:152
File: conferences/2025/general.json:468
Error: Found general conference with other stack: droidcon London
File: conferences/2025/android.json:18
File: conferences/2025/general.json:468
File: conferences/2025/networking.json:152
File: conferences/2025/networking.json:152