Fix invalid exception syntax: use tuple instead of list in HashRedactor

[Nepomuk5665]

Summary

This PR fixes a bug in stone/backends/python_rsrc/stone_validators.py where an except clause was using list syntax instead of tuple syntax for catching multiple exceptions.

The Bug

On line 714, the code was:

except [AttributeError, ValueError]:

This is invalid Python syntax. When Python attempts to execute this code, it raises:

TypeError: catching classes that do not inherit from BaseException is not allowed

The Fix

Changed to proper tuple syntax:

except (AttributeError, ValueError):

Verification

# Before (broken)
try:
    raise ValueError('test')
except [ValueError, AttributeError]:  # TypeError!
    print('caught')

# After (working)
try:
    raise ValueError('test')
except (ValueError, AttributeError):  # Works correctly
    print('caught')

Impact

This bug would cause HashRedactor.apply() to fail entirely whenever an AttributeError or ValueError is raised during hashing, preventing proper redaction of sensitive data.

[CLAassistant]

All committers have signed the CLA.

[alyx-db]

@Nepomuk5665

Thanks for your submission! I'll pass this along to the team for review.