chore: bump 6.0.0-dev

[erisu]

Motivation and Context

Bump for next major

Description

Bump to 6.0.0-dev

Testing

N/A

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.40%. Comparing base (584670d) to head (57abfd0).
⚠️ Report is 18 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #227   +/-   ##
=======================================
  Coverage   88.40%   88.40%           
=======================================
  Files          20       20           
  Lines        1147     1147           
=======================================
  Hits         1014     1014           
  Misses        133      133           

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[dpogue]

We want to bump to Node 20 as well, right? (or are you planning to do that in a separate PR?)

[erisu]

I did that in a separate PR: #228