Update kernel

1 job for master in 12 minutes and 35 seconds
Name Stage Failure
img Test
* Failure 404 Not Found
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Custom { kind: NotFound, error: "https://static.redox-os.org/pkg/x86_64-unknown-redox/ramfs.sig not found" }', src/libcore/result.rs:1189:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.
mk/initfs.mk:2: recipe for target 'build/initfs.tag' failed
make[1]: Leaving directory '/builds/redox-os/redox'
make[1]: *** [build/initfs.tag] Error 101
make: *** [ci-img] Error 2
Makefile:65: recipe for target 'ci-img' failed
ERROR: Job failed: exit code 1