Adjust range of swift-syntax versions to include the Swift 6.1 versions

[lovetodream]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.28%. Comparing base (3b01465) to head (d65ad05).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #3      +/-   ##
==========================================
+ Coverage   88.78%   96.28%   +7.50%     
==========================================
  Files           4        4              
  Lines         740      835      +95     
==========================================
+ Hits          657      804     +147     
+ Misses         83       31      -52     

Files with missing lines	Coverage Δ
...urces/PostgresNIOMacrosPlugin/StatementMacro.swift	96.56% <100.00%> (+12.64%)	⬆️
Tests/PostgresNIOMacrosTests/StatementTests.swift	84.84% <100.00%> (+1.26%)	⬆️

... and 1 file with indirect coverage changes

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