fix: continue parsing declarations after encountering ; in data-url

[bartveneman]

refs projectwallace/format-css#144

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.84%. Comparing base (0c5e906) to head (7f0e7a4).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #144   +/-   ##
=======================================
  Coverage   94.83%   94.84%           
=======================================
  Files          16       16           
  Lines        2693     2698    +5     
  Branches      704      706    +2     
=======================================
+ Hits         2554     2559    +5     
  Misses        139      139           

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[codecov-commenter]

Bundle Report

Changes will increase total bundle size by 268 bytes (0.18%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
@projectwallace/css-parser-esm	145.67kB	268 bytes (0.18%) ⬆️

Affected Assets, Files, and Routes:

view changes for bundle: @projectwallace/css-parser-esm

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
parse-*.js	268 bytes	7.19kB	3.87%

Files in parse-*.js:

• ./src/parse-declaration.ts → Total Size: 6.53kB