Update to Substrait v0.103.0

[substrait-project-bot]

Release Notes

0.103.0 (2026-08-30)

⚠ BREAKING CHANGES

• dialect: dialect files declaring EXTENSION_SINGLE,
  EXTENSION_MULTI or EXTENSION_LEAF must now list the message_types
  they support, the same way USER_DEFINED types have to name their
  extension. ExpandRel support is declared with CONSISTENT_FIELD
  rather than CONSTANT_FIELD, which never named a protobuf member.

Features

• dialect: check the dialect schema against the protos (#1173) (b92e97c)

Bug Fixes

• extensions: split shared type parameters in strpos and logb (#1186) (5a189e7)

See https://github.com/substrait-io/substrait/releases/tag/v0.103.0