Upgraded all dependencies using cargo-edit upgrade to solve previous errors in compilation

This commit added should_panic to tests which indicated by their context that they should panic given that they have the panic message in the comments. The only issue is not all of them panic but that should be solved in a separate fork

This changes appveyor configuration to use the nightly rustc compiler in order to use the recent stable-to-stable regression to compile

Temporarily removed stable as a rust option for github actions. This should be reverted when 1.74 is made the rustc stable version and is only due to the ICE error being presently resolved in nightly. This leads to some clear instability with nightly features, but it's currently the only option

Removed the stable requirement from .travis.yml for the rustc compiler

Updated nightly version in .travis.yml and fixed errors in previous commit regarding using solely the nightly version of rustc

Updated sccache install script to use version v0.5.4

Clear tmp file recursively to prevent cargo artifacts from interfering