Update to Substrait v0.93.0

[nielspardon]

Release notes

0.93.0 (2026-06-07)

⚠ BREAKING CHANGES

• protos: removes deprecated Expression.Enum message
• protos: removed args field from ScalarFunction
• protos: removed args field from AggregateFunction
• protos: removed args field from WindowFunction

Features

• protos: remove deprecated args fields (#1085) (d90dfcb)
• protos: remove deprecated Expression.Enum message (#1086) (f149482)

See https://github.com/substrait-io/substrait/releases/tag/v0.93.0

[nielspardon]

Implemented by #204 (spec bump to 0.96.0). All v0.93.0 changes are removals of deprecated protos: Expression.Enum, and the args fields on ScalarFunction/AggregateFunction/WindowFunction.

substrait-python already uses the replacement arguments field (e.g. utils/display.py) and never references Expression.Enum. The remaining .args references (simple_extension_utils.py, extension_registry/function_entry.py) are the extension-YAML schema (se.Impl.args/se.EnumerationArg), not the removed algebra protos. Nothing to migrate.