[mypy] Fix type annotations for boolean_algebra/quine_mc_cluskey.py (#5489)

* Add missing type annotation

* Fix conversion bug

This failed when called with the documented example of `1.5` and was correctly
pointed out by `mypy --strict`

boolean_algebra/quine_mc_cluskey.py

@@ -146,10 +146,10 @@ def prime_implicant_chart(
     return chart
 
 
-def main():
+def main() -> None:
     no_of_variable = int(input("Enter the no. of variables\n"))
     minterms = [
-        int(x)
+        float(x)
         for x in input(
             "Enter the decimal representation of Minterms 'Spaces Separated'\n"
         ).split()