fix(ci): Undo change in formatting workflow

[czentgr]

An accidental change was made that change one of the value to persist credentials from false to true.
This PR reverts this accidental change.

Introduced by: #26473

Description

Motivation and Context

Impact

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Revert accidental change to persist-credentials in the C++ formatting workflow by restoring its original value.

File-Level Changes

Change	Details	Files
Restore persist-credentials setting to false in GitHub Actions checkout step	Changed persist-credentials from true to false	.github/workflows/prestocpp-format-and-header-check.yml

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