fix: use dynamic in json instead of object

[kmartins]

No description provided.

[codecov-commenter]

Codecov Report

Merging #3 (fd92a8d) into main (4fb067e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main       #3   +/-   ##
=======================================
  Coverage   99.21%   99.21%           
=======================================
  Files           6        6           
  Lines         128      128           
=======================================
  Hits          127      127           
  Misses          1        1           

Impacted Files	Coverage Δ
packages/groveman/lib/src/debug_tree.dart	100.00% <ø> (ø)
packages/groveman/lib/src/groveman.dart	96.96% <ø> (ø)
packages/groveman/lib/src/log_record.dart	100.00% <ø> (ø)

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