Update data_substrate for DSS drain gates

[thweetkomputer]

Summary

Updates the data_substrate submodule to include the DataStoreService drain gate fix from:

• eloqdata/tx_service#521
• f6082b3 Fix DSS drain gates

Details

The submodule update brings in:

• sequentially consistent write gate/drain ordering for ReadWrite -> ReadOnly;
• read/scan submit-window draining before ReadOnly -> Closed calls backend Shutdown();
• the latest eloqstore main pointer used by the tx_service change.

This root PR intentionally only moves the data_substrate gitlink so eloqkv can consume the validated submodule change.

Validation

• cmake --build bld-eloqstore-local --target eloqkv -j2

Summary by CodeRabbit

• Chores
  • Updated the data substrate component to a newer revision.
  • No user-facing feature or behavior changes.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 3365ab11-e72c-4a12-b845-2fe33b6682b0

📥 Commits

Reviewing files that changed from the base of the PR and between f62482c and 11de874.

📒 Files selected for processing (1)

• data_substrate

🚧 Files skipped from review as they are similar to previous changes (1)

• data_substrate

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Walkthrough

The data_substrate subproject commit pointer is updated from 9cd8840d to 631a8b22. No public declarations or repository code are changed.

Changes

Substrate revision

Layer / File(s)	Summary
Subproject revision update data_substrate	The recorded data_substrate commit reference is updated to 631a8b2286eeca62897512cce833781f9b7f50d7.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Possibly related PRs

• eloqdata/eloqkv#333: Updates the same data_substrate subproject pointer without code changes.
• eloqdata/eloqkv#517: Bumps the same data_substrate submodule reference.
• eloqdata/eloqkv#482: Changes the pinned data_substrate commit.

Suggested labels: trigger-ci

Suggested reviewers: liunyl, lzxddz, mrguin, zhangh43, starrysky9959

Poem

A bunny checks the pointer bright,
From one small hash to one in sight.
No code hops, no branches sway,
Just substrate marching on its way.
- 🐇

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the main change: updating the data_substrate submodule for DSS drain gate fixes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-dss-read-write-drain-gate

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[CLAassistant]

All committers have signed the CLA.

[thweetkomputer]

I have performed a benchmark on an 8-core ARM VM. No degradation is found.