automation: Update devsec.hardening to version 7.15.0

This MR contains the following updates:

Package	Type	Update	Change
devsec.hardening (source)	galaxy-collection	minor	7.14.3 -> 7.15.0

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Release Notes

dev-sec/ansible-collection-hardening

v7.15.0

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Full Changelog

Implemented enhancements:

• Harden mountpoints #​531 [os_hardening] (lbayerlein)

Fixed bugs:

• os_hardening gpg-check enabled fails on success #​549 [os_hardening]
• add VM tests for os_hardening #​547 [os_hardening] (schurzi)
• Linting #​546 [mysql_hardening] [os_hardening] [ssh_hardening] [nginx_hardening] (rndmh3ro)

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