Fix DynamicTableRegion tests for latest HDMF

[bendichter]

Summary

• HDMF now validates DynamicTableRegion data bounds at construction time, raising IndexError for out-of-range values
• Updated two tests to construct DynamicTableRegion without the table argument first, then assign table afterwards to bypass validation while still testing our check function

Fixes #695

Test plan

• test_check_dynamic_table_region_data_validity_lt_zero passes
• test_check_dynamic_table_region_data_validity_gt_len passes
• All 47 tests in test_tables.py pass

🤖 Generated with Claude Code

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.55%. Comparing base (56c728c) to head (6cd3deb).

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #696      +/-   ##
==========================================
+ Coverage   80.01%   82.55%   +2.54%     
==========================================
  Files          48       48              
  Lines        1886     1886              
==========================================
+ Hits         1509     1557      +48     
+ Misses        377      329      -48     

see 3 files with indirect coverage changes

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[rly]

This is a duplicate of #681