Remove hex crate dependency

[jcamiel]

In

hurl/packages/hurl/src/runner/query.rs

Lines 1328 to 1330 in 9522750

	Value::Bytes(
	hex!("a8100ae6aa1940d0b663bb31cd466142ebbdbd5187131b92d93818987832eb89").to_vec()
	)

we're using the hex-literal crate.

The macro hex! is just use for test, in only one instance, it would be better to remove the dependency on hex-literal and replace the hex!. by a private function in the test module:

fn decode_hex(s: &str) -> Result<Vec<u8>, ParseIntError> {
    (0..s.len())
        .step_by(2)
        .map(|i| u8::from_str_radix(&s[i..i + 2], 16))
        .collect()
}