CI: remove t.Parallel() from TestAbsentTracking

[cce]

Summary

A tiny change to make this resource-intensive test a little less flaky.

Test Plan

Should pass

[gemini-code-assist]

Summary of Changes

Hello @cce, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses flakiness in the TestAbsentTracking function by removing its t.Parallel() call. The test is identified as resource-intensive and prone to flakiness due to heavy disk usage, and this change aims to stabilize its execution.

Highlights

• Test Flakiness Mitigation: Removed t.Parallel() from TestAbsentTracking in ledger/eval_simple_test.go to address flakiness, as this test is resource-intensive and interacts heavily with disk.

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[gemini-code-assist]

Code Review

This pull request removes t.Parallel() from the TestAbsentTracking test to make it less flaky in CI. Given that this is a resource-intensive test, running it sequentially is a sensible approach to improve stability by avoiding resource contention. The change is minimal, targeted, and well-justified. I approve.