Fix: Support Cardano `8.12`

[jpraynaud]

Content

This PR includes:

• A new configuration for the Cardano nodes to avoid a manual fix to make the nodes start
• The rollback of the sanchonet version to 8.11.0-pre following networking problems in 8.12.0-pre

Pre-submit checklist

• Branch
  • [x] Crates versions are updated (if relevant)
  • [x] Commit sequence broadly makes sense
  • [x] Key commits have useful messages
• PR
  • [x] No clippy warnings in the CI
  • [x] Self-reviewed the diff
  • [x] Useful pull request description
  • [x] Reviewer requested

Issue(s)

Relates to #1787

[github-actions[bot]]

Test Results

    4 files  ±0     51 suites  ±0   8m 41s :stopwatch: -12s 1 114 tests ±0  1 114 :white_check_mark: ±0  0 :zzz: ±0  0 :x: ±0  1 262 runs  ±0  1 262 :white_check_mark: ±0  0 :zzz: ±0  0 :x: ±0 

Results for commit 2ac64b39. ± Comparison against base commit b87a4c21.