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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[Lymia]

MSRP breaking. Will think about what to do.

[dependabot[bot]]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.