automation: Update devsec.hardening to version 7.15.1

This MR contains the following updates:

Package	Type	Update	Change
devsec.hardening (source)	galaxy-collection	patch	7.15.0 -> 7.15.1

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Release Notes

dev-sec/ansible-collection-hardening

v7.15.1

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Full Changelog

Fixed bugs:

• Fix broken mode for /var/log/audit #​552 [os_hardening] (hollow)

Merged pull requests:

• Only run hardening if /var/log/audit exists #​550 [os_hardening] (mego22)

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