update base64 and async-channel versions

[gruebel]

Changes

• also updated some dev dependencies, but those and relevant for actual usage

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.6%. Comparing base (7227314) to head (6aae298).
Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #169   +/-   ##
=====================================
  Coverage   53.6%   53.6%           
=====================================
  Files         44      44           
  Lines       6280    6280           
=====================================
  Hits        3372    3372           
  Misses      2908    2908           

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