test(audit): de-flake S3 export end-to-end test under parallel tests (#9849)

* [ee] test(audit): de-flake S3 export end-to-end test under parallel tests

Bumps the EE ref to pull in the companion fix for the flaky
`audit_export_end_to_end` test (`ee::audit_s3_export`). Postgres XIDs and the
snapshot xmin are cluster-wide, so under `--test-threads` a neighbor test's
in-flight transaction can hold the global xmin between this test's row xids,
deferring a committed row to a later export tick (`id 7 must be exported: got
[3,4,5,6]`). The EE change models successive ticks (drain until exported) and
waits for pre-existing rows to settle before anchors that must exclude them.

Test-only; no production code changes.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* chore: update ee-repo-ref to bdd4ba4dfd05c8ca7db365e530812dc914517d7f

This commit updates the EE repository reference after PR #639 was merged in windmill-ee-private.

Previous ee-repo-ref: 70c4c61257bda9263c158ef0ac58eb3aa9c55fa8

New ee-repo-ref: bdd4ba4dfd05c8ca7db365e530812dc914517d7f

Automated by sync-ee-ref workflow.

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Co-authored-by: windmill-internal-app[bot] <windmill-internal-app[bot]@users.noreply.github.com>

backend/ee-repo-ref.txt

@@ -1 +1 @@
-f814c3f75308c1ef1e4526d8d0eeb360ce16abe4
+bdd4ba4dfd05c8ca7db365e530812dc914517d7f