Update piston_window requirement to ^0.77.0

[dependabot-preview[bot]]

Updates the requirements on piston_window to permit the latest version.

Commits

- See full diff in [compare view](https://github.com/pistondevelopers/piston_window/commits)

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[sunjay]

@dependabot rebase

[sunjay]

@dependabot-bot rebase

[dependabot-preview[bot]]

Superseded by #77.

[dependabot-preview[bot]]

Looks like this PR is closed. If you re-open it, I'll rebase it, as long as no-one else has edited it.