Add missing asset entry for Bostrom

[jasbanza]

Description

Adding token: pool906F3CC4C0F4634031990DB81761BD390890F8A8A80460EBDC6B151254DE7D1D from chain Bostrom

Denom trace: https://rest.cosmos.directory/osmosis/ibc/apps/transfer/v1/denom_traces/9BBC8BD41DC282F0DF4709ED7562F5B12F161D8DD391386B79EF179AA50621C3

This is to alleviate the console errors from the frontend:

Checklist

Adding Assets

If adding a new asset, please ensure the following:

• Asset is registered to the Cosmos Chain Registry.
• Add asset to bottom of zone_assets.json.
  • chain_name and base_denom are provided and use values exactly as defined at the Chain Registry.
  • path is provided, and the IBC channel referenced is registered at the Chain Registry (skip if native to Osmosis).
  • osmosis_verified is set to false
  • Optional: transfer_methods, override_properties, canonical, categories, where necessary (see README for details).
• I am aware that upgrading an asset to 'Verified' status requires an additional PR to this repo (checklist below).