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 49.41%. Comparing base (1e7c0fb) to head (52f0232).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2606      +/-   ##
============================================
- Coverage     49.83%   49.41%   -0.42%     
+ Complexity     4881     2048    -2833     
============================================
  Files           954      524     -430     
  Lines         58333    29705   -28628     
  Branches       6302     3040    -3262     
============================================
- Hits          29068    14680   -14388     
+ Misses        27189    14115   -13074     
+ Partials       2076      910    -1166     

Components	Coverage Δ
spanner-templates	71.09% <ø> (+0.93%)	⬆️
spanner-import-export	∅ <ø> (∅)
spanner-live-forward-migration	79.33% <ø> (ø)
spanner-live-reverse-replication	77.03% <ø> (ø)
spanner-bulk-migration	88.23% <ø> (ø)
see 446 files with indirect coverage changes

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