Proposal to Open a New Branch for PR

[fabracht]

Hello,

I've been using the embedded-websocket crate in my ESP32 project and encountered dependency conflicts due to the outdated versions of some dependencies, particularly rand. To resolve this, I made some modifications to update the following dependencies:

heapless: 0.7.16 → 0.8.0, because, why not update it already
base64: 0.13.1 → 0.22.1

These changes also required adjustments to the codebase to accommodate the newer APIs introduced by the newer version of base64. For instance, base64 now uses an Engine interface, and I had to fix some other minor modifications.

Would it be okay for me to open a new branch to submit a pull request with these changes?