kernelPatches.rust_1_77-6_8,kernelPatches.rust_1_77-6_9: update

Some changes were made when this patch was committed to rust-next.
Most importantly, the minimum rustc version was updated from 1.77.0 to
1.77.1, and if we use the latest version of the patch, we'll be able
to cleanly apply the 1.78.0 patch.

rust-next gets force pushed sometimes[1], so we shouldn't fetch from
it in a FOD, hence we now have rust-1.77-6.8.patch in-tree, but this
will save us from having rust-1.78.patch in-tree, which we can fetch
from lore.

[1]: https://github.com/Rust-for-Linux/linux/activity?ref=rust-next