Update syn requirement from 1 to 2

[dependabot[bot]]

Updates the requirements on syn to permit the latest version.

Release notes

Sourced from syn's releases.

2.0.31

• Parse generics and where-clause on const items (rust-lang/rust#113521)

Commits

• b20e2c8 Release 2.0.31
• 0cfdca7 Merge pull request #1503 from dtolnay/constverbatim
• 8cdfd09 Parse const item with generics as Verbatim
• b80156e Adjust implementation of where-clause parsing on const items
• d73386e Parse where-clause on const item without value expr
• 3805187 Update CStr literal link
• 5751455 Link to issue for tail call syntax
• 5ede892 Merge pull request #1500 from dtolnay/dupexclude
• f3727bf Detect duplication between excluded files and dirs
• ecfbe2e Detect duplicate entries in exclusion lists
• Additional commits viewable in compare view

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[slawlor]

@dependabot rebase

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (875afad) 78.91% compared to head (0cb527a) 78.91%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #155 +/- ## ======================================= Coverage 78.91% 78.91% ======================================= Files 49 49 Lines 8945 8945 ======================================= Hits 7059 7059 Misses 1886 1886 ``` | [Files Changed](https://app.codecov.io/gh/slawlor/ractor/pull/155?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Sean+Lawlor) | Coverage Δ | | |---|---|---| | [ractor\_cluster\_derive/src/lib.rs](https://app.codecov.io/gh/slawlor/ractor/pull/155?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Sean+Lawlor#diff-cmFjdG9yX2NsdXN0ZXJfZGVyaXZlL3NyYy9saWIucnM=) | `96.96% <100.00%> (ø)` | |

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