Update indoc requirement from 1.0 to 2.0

[dependabot[bot]]

Updates the requirements on indoc to permit the latest version.

Release notes

Sourced from indoc's releases.

2.0.0

• Change handling of final newline at zero levels of indentation (#55)
• Add concatdoc! macro (#56)
• Raise oldest supported rustc to 1.56

Commits

• bbbec14 Release 2.0.0
• 24a804e Add concatdoc docs
• 476b937 Delete paths from .cargo/config
• b5fb2dc Merge pull request #57 from dtolnay/fromstr
• 623d666 Replace TokenStream::from_str with Literal::from_str
• 28d6d25 Switch to 2021 edition
• 46d38c0 Merge pull request #56 from dtolnay/concat
• 4fec8a9 Add concatdoc macro
• 1f70529 Merge pull request #55 from dtolnay/trailing
• 31694b5 Preserve last newline even if not indented
• Additional commits viewable in compare view

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[jonmcquillan]

@dependabot rebase

[dependabot[bot]]

Looks like this PR is already up-to-date with master! If you'd still like to recreate it from scratch, overwriting any edits, you can request @dependabot recreate.