Bump proc-macro2 from 1.0.19 to 1.0.23

[dependabot[bot]]

Bumps proc-macro2 from 1.0.19 to 1.0.23.

Release notes

Sourced from proc-macro2's releases.

1.0.23

• Fix several bugs involving lexing of unicode escapes and carriage returns in string literals (#256, #257, #258, #259, #260)

1.0.22

• Fix several bugs involving lexing of integer and float tokens with unusual suffixes (#252, #253, #254, #255)

1.0.21

• Match libproc_macro's UnwindSafe and RefUnwindSafe impls (#250)

1.0.20

• Match libproc_macro's rendering of whitespace in groups (#246, #247, thanks @​Koxiaet)

Commits

• 4e42b88 Release 1.0.23
• ac56ac4 Consistent way to check for \n after \r
• 72f39fa Require newline after carriage returns that follow backslash newline
• 22bf66f Allow carriage return in raw string if followed by newline
• 0af589a Add test of carriage return newline in raw string
• 7c3b8ed Do not allow beginning of string token as ident
• 5d5fdb3 Merge pull request #260 from dtolnay/lit
• af9dd20 Disallow lifetime followed immediately by single quote
• 247e127 Add test of lifetime followed immediately by single quote
• d7e204f Merge pull request #259 from dtolnay/lit
• Additional commits viewable in compare view

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