Escape punctuation in UpdateHeuristic.toFlexibleRegex

[fthomas]

No description provided.

[codecov]

Codecov Report

Merging #1945 (6b1c9c9) into master (813e9a7) will decrease coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1945      +/-   ##
==========================================
- Coverage   78.44%   78.40%   -0.05%     
==========================================
  Files         129      129              
  Lines        2227     2227              
  Branches       59       59              
==========================================
- Hits         1747     1746       -1     
- Misses        480      481       +1     

Impacted Files	Coverage Δ
...a/org/scalasteward/core/edit/UpdateHeuristic.scala	98.82% <100.00%> (-1.18%)	⬇️

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