Bump syn from 2.0.38 to 2.0.40

[dependabot[bot]]

Bumps syn from 2.0.38 to 2.0.40.

Release notes

Sourced from syn's releases.

2.0.40

• Fix some edge cases of handling None-delimited groups in expression parser (#1539, #1541, #1542, #1543, #1544, #1545)

2.0.39

• Fix parsing of return expression in match guards (#1528)
• Improve error message on labeled loop as value expression for break (#1531)

Commits

• cf7f40a Release 2.0.40
• 1ce8ccf Merge pull request #1538 from dtolnay/testinvisible
• d06bff8 Add test for parsing Delimiter::None in expressions
• 9ec66d4 Merge pull request #1545 from dtolnay/groupedlet
• 384621a Fix None-delimited let expression in stmt position
• 5325b6d Add test of let expr surrounded in None-delimited group
• 0ddfc27 Merge pull request #1544 from dtolnay/nonedelimloop
• 9c99b3f Fix stmt boundary after None-delimited group containing loop
• 2781584 Add test of None-delimited group containing loop in match arm
• d332928 Simplify token stream construction in Delimiter::None tests
• Additional commits viewable in compare view

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (6711ddb) 91.65% compared to head (58168e9) 91.65%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #191 +/- ## ======================================= Coverage 91.65% 91.65% ======================================= Files 14 14 Lines 1126 1126 ======================================= Hits 1032 1032 Misses 94 94 ```

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[dependabot[bot]]

Superseded by #192.