Fixing broken links in Xiaomi-Mijia-Bedside-Lamp-2/index.md

[sfromis]

The linked repository https://github.com/mmakaay/esphome-xiaomi_bslamp2 no longer has a "main" branch; links changed to refer to the "dev" branch", preferring this over one of the "release/" branches. OK?

Brief description of the changes

Type of changes

• New device
• Update existing device
• Removing a device
• General cleanup
• Other

Checklist:

• There are no passwords or secrets references in any examples.
  The only exceptions are !secret wifi_ssid and !secret wifi_password.
• The wifi or ethernet block has no static / manual ip address specified.
• The first configuration provided should be hardware definitions only.
  A more involved example can be provided in a separate configuration block.

[netlify]

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