fix: Skipped validation on an unsupported regular expression in patternProperties

[Stranger6667]

Fixes #213

[codecov]

Codecov Report

Merging #214 (e8823b1) into master (8ba3e71) will increase coverage by 0.04%.
The diff coverage is 57.14%.

@@            Coverage Diff             @@
##           master     #214      +/-   ##
==========================================
+ Coverage   82.73%   82.77%   +0.04%     
==========================================
  Files          53       53              
  Lines        3567     3571       +4     
==========================================
+ Hits         2951     2956       +5     
+ Misses        616      615       -1     

Impacted Files	Coverage Δ
jsonschema/src/keywords/additional_properties.rs	84.26% <57.14%> (+0.31%)	⬆️

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