Avoid using deprecated method for getproperties

[fhagemann]

Looks like we are using a deprecated method for TypesTable.getproperties in our package:
https://github.com/JuliaData/TypedTables.jl/blob/702cf7fdde8d6ac9822c8f43d695b50f6b183508/src/properties.jl#L87

I did not test whether this still works, but it's throwing deprecation warnings in tests.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 40.26%. Comparing base (12c1d59) to head (0852248).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
ext/LegendDataManagementLegendHDF5IOExt.jl	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #105   +/-   ##
=======================================
  Coverage   40.26%   40.26%           
=======================================
  Files          27       27           
  Lines        2074     2074           
=======================================
  Hits          835      835           
  Misses       1239     1239           

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