[cargo](deps): Bump syn from 2.0.26 to 2.0.28

[dependabot[bot]]

Bumps syn from 2.0.26 to 2.0.28.

Release notes

Sourced from syn's releases.

2.0.28

• Fix inconsistency between full and non-full expression parse errors (#1491)

2.0.27

• Documentation improvements (thanks @​GuillaumeGomez)

Commits

• 44c5fdd Release 2.0.28
• 65aa662 Merge pull request #1491 from dtolnay/expectedexpr
• 91c84f6 Fix trivial difference between full and non-full expression parse errors
• f79ba15 Update test suite to nightly-2023-07-29
• 41c3847 Update test suite to nightly-2023-07-27
• a171121 Release syn-codegen 0.4.1
• dd250f4 Also add --generate-link-to-definition for syn-codegen
• bb23493 Release 2.0.27
• e3a15a9 Opt in to generate-link-to-definition when building on docs.rs
• 36a743a Merge pull request #1490 from dtolnay/docinline
• Additional commits viewable in compare view

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[codecov[bot]]

Codecov Report

Merging #40 (8c5c5db) into master (77bc0d3) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #40   +/-   ##
=======================================
  Coverage   84.17%   84.17%           
=======================================
  Files           5        5           
  Lines        3040     3040           
=======================================
  Hits         2559     2559           
  Misses        481      481           

[dependabot[bot]]

Superseded by #45.