refactor(yaml): cleanup dead code in float Type implementation

[iuioiua]

According to the spec, it seems that the float type shouldn't contain a : (see https://yaml.org/spec/1.2.2/#10214-floating-point).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.39%. Comparing base (d6dde6f) to head (2e8d132).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5526      +/-   ##
==========================================
+ Coverage   96.36%   96.39%   +0.02%     
==========================================
  Files         465      465              
  Lines       37760    37747      -13     
  Branches     5578     5576       -2     
==========================================
- Hits        36388    36386       -2     
+ Misses       1330     1319      -11     
  Partials       42       42              

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[kt3k]

colon separated numbers are sexagesimals (1:00 equals 60 as int, also 1:00.0 equals 60.0 as float). It was part of spec in YAML 1.1. ref: https://yaml.org/type/float.html, but it seems to have been dropped in 1.2. Probably it's fine to remove as we mainly target 1.2

BTW we already tests sexagesimals for int types. Probably we should remove them as well for consistency

[kt3k]

LGTM