Fix typing for FloatPrompt

[xymy]

Type of changes

• Bug fix
• New feature
• Documentation / docstrings
• Tests
• Other

Checklist

• I've run the latest black with default args on new code.
• I've updated CHANGELOG.md and CONTRIBUTORS.md where appropriate.
• I've added tests for new code.
• I accept that @willmcgugan may be pedantic in the code review.

Description

Fix typing for FloatPrompt from class FloatPrompt(PromptBase[int]): to class FloatPrompt(PromptBase[float]):.

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (aabfd16) 98.30% compared to head (832a795) 98.28%.
Report is 34 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3151      +/-   ##
==========================================
- Coverage   98.30%   98.28%   -0.03%     
==========================================
  Files          74       74              
  Lines        8038     8043       +5     
==========================================
+ Hits         7902     7905       +3     
- Misses        136      138       +2     

Flag	Coverage Δ
unittests	98.28% <93.33%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
rich/_export_format.py	100.00% <ø> (ø)
rich/align.py	100.00% <ø> (ø)
rich/console.py	98.04% <100.00%> (+<0.01%)	⬆️
rich/containers.py	100.00% <ø> (ø)
rich/markdown.py	99.45% <100.00%> (ø)
rich/markup.py	100.00% <ø> (ø)
rich/panel.py	98.29% <ø> (ø)
rich/progress.py	92.92% <ø> (ø)
rich/prompt.py	100.00% <100.00%> (ø)
rich/syntax.py	98.19% <100.00%> (-0.29%)	⬇️
... and 1 more

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[darrenburns]

Thanks!