Update proc-macro-crate requirement from 1 to 2

[dependabot[bot]]

Updates the requirements on proc-macro-crate to permit the latest version.

Release notes

Sourced from proc-macro-crate's releases.

v2.0.0

What's Changed

• Release 2.0.0 by @​bkchr in bkchr/proc-macro-crate#39

Full Changelog: https://github.com/bkchr/proc-macro-crate/compare/v1.3.1...v2.0.0

Commits

• cc100ed Merge pull request #39 from bkchr/bkchr-2.0.0
• 39a7c18 Release 2.0.0
• 1fdce5d Merge pull request #33 from bkchr/bkchr-release-1.3.1
• 39716a7 Release 1.3.1
• 5df7139 Merge pull request #32 from MarijnS95/toml_edit-0.19
• a0b717a Bump MSRV to 1.60
• 1cf0fc0 Bump toml_edit to 0.19
• 0ec934a Merge pull request #30 from bkchr/release-1.3.0
• 27e449c Merge pull request #31 from bkchr/bkchr-fix-multiple-crates
• a9aa118 Fix finding crates which import itself
• Additional commits viewable in compare view

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[GodotRust]

API docs are being generated and will be shortly available at: https://godot-rust.github.io/docs/gdnative/pr-1057

[chitoyuu]

Not sure why it had to go to 2.0 to do that, but apparently it now handles workspace dependencies, which could be relevant I think?

Minimal CI passes so I'll try a merge first.

bors r+

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