fix(tests): run Bogota fixtures on the Amsterdam spec in the json loader

[AnkushinDaniil]

Description

Since the rebase onto newer forks/amsterdam (#3564), the json loader only knows forks that have an ethereum.forks.* module. Bogota is a test-only fork on the Amsterdam spec, so json-loader fails on AmsterdamToBogotaAtTime15k and validate-blocks drops every Bogota fixture and exits 5 in fill (bogota). This maps Bogota to the Amsterdam spec.

Checked locally: tests/json_loader/test_fork_transition_networks.py 24 passed. Filled 27 Bogota blockchain fixtures (-k nonce); validate-blocks on them gives exit 5 without the change and 53 passed with it.

Related Issues or PRs

Unblocks CI on #3682, #3683.

Checklist

• Ran fast static checks to avoid CI fails: ruff check, ruff format --check on the changed file
• PR title has the form <type>(<area>): <title>

[spencer-tb]

Closing as we no longer need the alias :) we now have the real Bogota fork module from #3665