build: fix -Zminimal-versions

[paolobarbolini]

serde_json::Value started implementing Hash starting from v1.0.118

[oli-obk]

While you're at it, can you add this flag to the nightly CI?

[weihanglo]

You might want direct-minimal-versions instead

[ia0]

Thanks for the PR! I just hit this issue. For reference this was introduced by #271. And we could argue that serde_json should have bumped the minor version for that, but that's orthogonal.

[paolobarbolini]

And we could argue that serde_json should have bumped the minor version for that, but that's orthogonal.

I don't know why but David never bumps minor version.