Relax again the braced placeholder tokenizer

[lu-zero]

The assumption that we store only alphanumerics does not hold see sqlx-conditional-queries and sea-query

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.28%. Comparing base (5d91ad6) to head (4858325).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #114   +/-   ##
=======================================
  Coverage   99.27%   99.28%           
=======================================
  Files           6        6           
  Lines        3887     3897   +10     
  Branches     3887     3897   +10     
=======================================
+ Hits         3859     3869   +10     
  Misses         20       20           
  Partials        8        8           

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