Bump proc-macro2 from 1.0.46 to 1.0.52

[dependabot[bot]]

Bumps proc-macro2 from 1.0.46 to 1.0.52.

Release notes

Sourced from proc-macro2's releases.

1.0.52

• Add Group::delim_span (#366)

1.0.51

• Implement rustc's limit on the number of # used for delimiting a raw string literal: 255 (#364)

1.0.50

• Implement Hash for proc_macro2::LineColumn (#362)

1.0.49

• Opt out of -Zrustdoc-scrape-examples on docs.rs for now

1.0.48

• Documentation improvements

1.0.47

• Fix integer overflow when nesting depth of nested comments exceeds 4 billion (#357)

Commits

• ab25487 Release 1.0.52
• 006d135 Merge pull request #367 from dtolnay/fallback
• 96da1a2 Rename 'stable' terminology to 'fallback'
• 65699c4 Merge pull request #366 from dtolnay-contrib/delim
• 0dc8736 Add DelimSpan to hold the 3 different spans of a delimiter
• 1e7fc7b Expand documentation of Group::delimiter
• 68bfd52 Format test cfg attributes with rustfmt
• 23d5478 Fix warning on duplicate test ignore attribute
• e1fa732 Account for proc_macro::Span layout change between 1.31 and 1.32
• 6083bef More specifically run make_sure_no_proc_macro test in CI
• Additional commits viewable in compare view

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