dav1d: update to 1.4.1 to fix dav1d-sys crate build in gst-plugins-rs

Hi all,

In https://github.com/rust-av/dav1d-rs/commit/3a5c34b8e830c2f9eed71e965f9f2c6ba1490776, @slomo updated the minimum version of dav1d to 1.3.0.

For some reason, it hasn't caused a CI failure yet, but as soon as I updated my copy of gst-plugins-rs Cargo pulled the new dav1d and dav1d-sys crates, causing a configuration failure as we ship only 1.1.0 here.

This MR takes care of that by updating dav1d to 1.4.1. I've tested that it builds for Android, but nothing more as I am getting an unrelated crash coming from the TinyALSA MR. I'd appreciate it if someone could give it a go, and ensure nothing else breaks with the update.