getHeader case sensitive

[uacode]

Hello, @dacastro4 I received this email
....
Received: from 14092732981 named unknown by gmailapi.google.com with HTTPREST;
Tue, 24 Jan 2023 12:19:44 -0600
MIME-Version: 1.0
from: Octopus Moving Solutions info@octopuscrates.com
Date: Tue, 24 Jan 2023 12:19:44 -0600
To: user@domain.com
....

But parser in getFrom returns null. We can add $this->getHeader('from') in this method.

Or can modify searching in HasHeaders trait
if (ucfirst($header->key) === $headerName) {

What is correct? If you need I can push PR.

Thanks!