Bump parquet-avro version to 1.15.2

[jrmccluskey]

Bump parquet-avro to 1.15.2 to address CVE-2025-46762

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.82%. Comparing base (1e7c0fb) to head (52f0232).
⚠️ Report is 15 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2606      +/-   ##
============================================
- Coverage     49.83%   49.82%   -0.02%     
- Complexity     4881     5232     +351     
============================================
  Files           954      954              
  Lines         58333    58333              
  Branches       6302     6302              
============================================
- Hits          29068    29062       -6     
- Misses        27189    27192       +3     
- Partials       2076     2079       +3     

Components	Coverage Δ
spanner-templates	70.14% <ø> (-0.02%)	⬇️
spanner-import-export	68.61% <ø> (-0.04%)	⬇️
spanner-live-forward-migration	79.33% <ø> (ø)
spanner-live-reverse-replication	77.03% <ø> (ø)
spanner-bulk-migration	88.23% <ø> (ø)
see 3 files with indirect coverage changes

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