bump: update syn requirement from 1.0 to 2.0

[dependabot[bot]]

Updates the requirements on syn to permit the latest version.

Release notes

Sourced from syn's releases.

2.0.2

• Documentation improvements

Commits

• cac5cc6 Release 2.0.2
• 8f826ef Touch up spacing in example for parse_multi_with_leading_vert
• fc58fcf Fix typo in Stmt::Macro documentation
• e298152 Release 2.0.1
• b87a0a1 Merge pull request #1409 from dtolnay/requiremeta
• 59dd7cc Add methods on Meta for error reporting an incorrect kind of attribute
• 11c0b6c Build attribute parse errors using std::fmt system
• e6cf741 Move parse_args_with error handler into parsing module
• 906fa56 Release 2.0.0
• 29bd855 Fix warning about Cargo.toml exclude/include
• Additional commits viewable in compare view

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[Wodann]

@dependabot rebase

[dependabot[bot]]

Dependabot tried to update this pull request, but something went wrong. We're looking into it, but in the meantime you can retry the update by commenting @dependabot rebase.

[Wodann]

@dependabot rebase

[dependabot[bot]]

Dependabot tried to update this pull request, but something went wrong. We're looking into it, but in the meantime you can retry the update by commenting @dependabot rebase.

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If you change your mind, just re-open this PR and I'll resolve any conflicts on it.

[Wodann]

@dependabot reopen

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Dependabot tried to update this pull request, but something went wrong. We're looking into it, but in the meantime you can retry the update by commenting @dependabot rebase.

[codecov[bot]]

Codecov Report

Merging #518 (541e12c) into main (d533fce) will decrease coverage by 0.01%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #518      +/-   ##
==========================================
- Coverage   84.35%   84.34%   -0.01%     
==========================================
  Files         275      275              
  Lines       31102    31105       +3     
==========================================
  Hits        26236    26236              
- Misses       4866     4869       +3     

Impacted Files	Coverage Δ
crates/mun_codegen_macros/src/lib.rs	0.15% <0.00%> (-0.01%)	:arrow_down:

[Wodann]

@baszalmstra can this be merged?