[7.17] ironbank: update hardening to 8.8 (backport #11788)

[mergify]

This is an automatic backport of pull request #11788 done by Mergify.
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	both modified:   packaging/ironbank/hardening_manifest.yaml.tmpl

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[v1v]

As far as I see, #8732 was not backported to 7.17 hence we keep using beat_version

[mergify]

This pull request has not been merged yet. Could you please review and merge it @v1v? 🙏