Update phosphor packages to restore tab drop zone

[jasongrout]

This pulls in the tab drop zone change in @phosphor/widgets 1.7.0.

References

Fixes #5406

Code changes

Updates phosphor packages.

User-facing changes

See the updated tab drop behavior at phosphorjs/phosphor#365 (screenshots are there).

Backwards-incompatible changes

None

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[jasongrout]

After merging this, I think we should release another alpha so people have time to test this user-facing change more widely.

[blink1073]

Thanks! Should we wait for #6445? I have a bit more work to do on it tomorrow morning.

[jasongrout]

Should we wait for #6445? I have a bit more work to do on it tomorrow morning.

Sounds good to me.

[jasongrout]

Thanks! Should we wait for #6445? I have a bit more work to do on it tomorrow morning.

@blink1073 - can you do the release, then?

[blink1073]

I'm trying to automate myself out of the role of release manager; it is too stressful for me.

[lock]

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