Bump syn from 1.0.107 to 1.0.109

[dependabot[bot]]

Bumps syn from 1.0.107 to 1.0.109.

Release notes

Sourced from syn's releases.

1.0.108

• Fix handling of unusual whitespace after escaped newlines in LitStr::value (#1381, thanks @​ModProg)

Commits

• bfa790b Release 1.0.109
• c182545 Restore compatibility with rust 1.31
• 01f69e9 Release 1.0.108
• 62d0aed stricter parsing of string_continue escapes
• See full diff in compare view

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[mihai-dinculescu]

@dependabot rebase

[dependabot[bot]]

Superseded by #28.