chore(deps): bump substrait packages to 0.103.0

[nielspardon]

Closes #256.

Bumps substrait-protobuf, substrait-extensions, and substrait-antlr to spec v0.103.0 (release notes).

• The breaking change only concerns dialect files (message_types for EXTENSION_* relations, CONSISTENT_FIELD for ExpandRel). This repo neither reads nor ships dialect files, so nothing changes here.
• strpos (varchar) and logb (decimal) now use independent type parameters for their two arguments. This is a pure relaxation with unchanged compact signatures (strpos:vchar_vchar, logb:dec_dec), so calls that resolved before still resolve with the same output type.

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Reviewing files that changed from the base of the PR and between d382186 and f2ff4c6.

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📒 Files selected for processing (1)

• pyproject.toml

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📝 Summary

Summary by CodeRabbit

• Chores
  • No user-facing changes are included in this release. Existing functionality and behavior remain unchanged.

Walkthrough

The project dependency declarations for Substrait runtime, optional, and development dependencies changed from version 0.102.0 to 0.103.0.

Changes

Substrait dependency update

Layer / File(s)	Summary
Update Substrait dependency pins pyproject.toml	The runtime pins for substrait-protobuf and substrait-extensions, and the optional and development pins for substrait-antlr, changed from 0.102.0 to 0.103.0.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Other

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Merge Risk: ⚪ Minimal · up to f2ff4

The dependency update preserves the protobuf interfaces used by the repository, and the changed dialect schemas are not consumed here. No actionable merge-blocking risk was identified.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check		The title is concise, specific, and uses a valid Conventional Commit format. It accurately describes the dependency upgrades to Substrait packages.
Description check		The description explains the upgrade rationale, references the related issue and release notes, and documents the relevant breaking and behavioral changes. It provides the information required by the …
Linked Issues check		Issue #256 requires an update to Substrait v0.103.0. pyproject.toml updates substrait-protobuf, substrait-extensions, and substrait-antlr from 0.102.0 to 0.103.0. The PR description addres…
Out of Scope Changes check		The supplied whole-PR summary shows only four dependency declaration changes in pyproject.toml. These changes directly implement issue #256. No unrelated source or configuration changes are shown. L…
Docstring Coverage		No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…

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