chore: update autobahn version

[mccutchen]

Apparently they dropped the old tags after making a new release?

[github-actions]

🔥 Run benchmarks comparing 56b4bb6 against main:

gh workflow run bench.yaml -f pr_number=67

Note: this comment will update with each new commit.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.66%. Comparing base (304228d) to head (56b4bb6).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #67      +/-   ##
==========================================
- Coverage   96.68%   96.66%   -0.02%     
==========================================
  Files           2        2              
  Lines         573      570       -3     
==========================================
- Hits          554      551       -3     
  Misses         14       14              
  Partials        5        5              

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