🐛 Fix scientific notation in QASM import

[burgholzer]

Description

This PR fixes a small bug in the QASM importer that would prevent it from properly importing floating point numbers in scientific notation.

Checklist:

• The pull request only contains commits that are related to it.
• I have added appropriate tests and documentation.
• I have made sure that all CI jobs on GitHub pass.
• The pull request introduces no new warnings and follows the project's style guidelines.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.1%. Comparing base (a392c48) to head (76c6a04).

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #560   +/-   ##
=====================================
  Coverage   91.1%   91.1%           
=====================================
  Files        132     132           
  Lines      13794   13804   +10     
  Branches    2166    2171    +5     
=====================================
+ Hits       12573   12583   +10     
  Misses      1221    1221           

Flag	Coverage Δ
cpp	90.8% <100.0%> (+<0.1%)	⬆️
python	99.5% <ø> (ø)

Files	Coverage Δ
src/parsers/qasm3_parser/Scanner.cpp	96.8% <100.0%> (+<0.1%)	⬆️