Bump shopware/shopware from 5.6.6 to 5.6.9

Bumps [shopware/shopware](https://github.com/shopware/shopware) from 5.6.6 to 5.6.9.
- [Release notes](https://github.com/shopware/shopware/releases)
- [Commits](shopware/shopware@v5.6.6...v5.6.9)

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