Remove the ambiguity from the PostScript number regex

[calixteman]

\d+\.?\d* can split a run of digits in as many ways as it is long, so it would backtrack polynomially if anything following it could reject. The optional exponent can't, hence no bug today, but \d+(?:\.\d*)? accepts the same numbers unambiguously.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.02%. Comparing base (e57a464) to head (16f5691).

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #21709      +/-   ##
==========================================
- Coverage   90.04%   90.02%   -0.02%     
==========================================
  Files         264      264              
  Lines       66894    66894              
==========================================
- Hits        60232    60220      -12     
- Misses       6662     6674      +12     

Flag	Coverage Δ
browsertest	66.52% <100.00%> (+<0.01%)	⬆️
fonttest	9.03% <ø> (ø)
integrationtest	69.35% <100.00%> (-0.01%)	⬇️
unittest	57.88% <100.00%> (-0.01%)	⬇️
unittestcli	56.60% <100.00%> (ø)

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[timvandermeij]

Preventing issues here seems like a good idea, so thanks!