Bump hstspreload from 2020.1.3 to 2020.1.7 in /server

Bumps [hstspreload](https://github.com/sethmlarson/hstspreload) from 2020.1.3 to 2020.1.7.
- [Release notes](https://github.com/sethmlarson/hstspreload/releases)
- [Commits](sethmlarson/hstspreload@2020.1.3...2020.1.7)

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