Bump ractor dependencies to match their actual use (#285)

[zhapich]

This addresses issue #285. I went over ractor's dependencies and bumped them where the minimum required version didn't match actual use in code - e.g. use of JoinSet::join_all that was only introduced in tokio 1.40.0.

This change is non-breaking - a project that uses ractor and successfully builds must already use versions of tokio/bon at least as recent as these bumped versions.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.34%. Comparing base (3322d40) to head (9e6fda3).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #286   +/-   ##
=======================================
  Coverage   81.34%   81.34%           
=======================================
  Files          60       60           
  Lines       10848    10848           
=======================================
  Hits         8824     8824           
  Misses       2024     2024           

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