Bump version number to 1.5.0

[SchrodingersGat]

TODO

• Update version number
• Update CHANGELOG.md
• Add 1.5.x demo dataset branch

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.78%. Comparing base (324b0ca) to head (a0bfdd4).

Additional details and impacted files

@@           Coverage Diff           @@
##            1.5.x   #12602   +/-   ##
=======================================
  Coverage   86.78%   86.78%           
=======================================
  Files        1447     1447           
  Lines       96780    96780           
  Branches    11267    11267           
=======================================
  Hits        83990    83990           
  Misses      12726    12726           
  Partials       64       64           

Flag	Coverage Δ
backend	90.77% <100.00%> (ø)

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Components	Coverage Δ
Backend Apps	92.14% <ø> (ø)
Backend General	93.56% <ø> (ø)
Frontend	79.72% <ø> (ø)

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