Update base toolchain

[nuke-web3]

#8 was the last update to 1.73.0-dev and it would be nice to have a bum to update to the latest stable, as some major crates now require it (like clap):

error: package `clap v4.5.1` cannot be built because it requires rustc 1.74 or newer, while the currently active rustc version is 1.73.0-dev

So in my case, simply 1.74 would suffice, but 1.78 is out now and (I hope) would not be hard to merge/rebase this repo to upstream stable.