BasisState accepts floats

[timmysilv]

Context:
It's been failing all over since switching DQL with DQ2

Description of the Change:
Cast inputted values to float before making state vector

Benefits:
Float inputs are accepted and CI is fixed, parity with DQL

Possible Drawbacks:
N/A

Related GitHub Issues:
PennyLaneAI/pennylane-rigetti#142

[github-actions]

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Please edit doc/releases/changelog-dev.md with:

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[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (9a83734) 99.63% compared to head (7db3acf) 99.63%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4632   +/-   ##
=======================================
  Coverage   99.63%   99.63%           
=======================================
  Files         376      376           
  Lines       33616    33617    +1     
=======================================
+ Hits        33492    33493    +1     
  Misses        124      124           

Files	Coverage Δ
pennylane/ops/qubit/state_preparation.py	100.00% <100.00%> (ø)

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