gha: bump step-security/harden-runner from 2.5.1 to 2.6.0 (#2390)
Bumps [step-security/harden-runner](https://github.com/step-security/harden-runner) from 2.5.1 to 2.6.0.
- [Release notes](https://github.com/step-security/harden-runner/releases)
- [Commits](https://github.com/step-security/harden-runner/compare/8ca2b8b2ece13480cda6dacd3511b49857a23c09...1b05615854632b887b69ae1be8cbefe72d3ae423)
---
updated-dependencies:
- dependency-name: step-security/harden-runner
dependency-type: direct:production
update-type: version-update:semver-minor
...
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