Panic when parsing '0' using parseFloat

[ocean2811]

Describe the bug
Panic when parsing '0'(number without decimals) as a float type.

To Reproduce

const file = `foo = 0` // read from .toml file

type Toml struct {
    Foo float64 `toml:"foo"`
}

t := &Toml{}
err := toml.Unmarshal([]byte(file), t)
fmt.Println(t, err)
return

Expected behavior
Normal output of TOML structure contents.

Versions

• go-toml: v2.0.9 (e183db7)
• go: version 1.20.4
• operating system: Windows, Linux