The prior workflow (now deleted) required manually specifying the packages to
check and only checked the package could compile under the stated MSRV. It
didn't verify it was actually the _minimum_ supported Rust version. The new
version finds the MSRV from scratch to check if the stated MSRV aligns.
Updates stated MSRVs accordingly.
Also removes many explicit dependencies from secq256k1 for their re-exports via
k256. Not directly relevant, just part of tidying up all the `toml`s.
The rational is detailed in the root Cargo.toml.
While I don't personally mind MPL dependencies, even if I don't prefer them
(they're allowed in the deny.toml for a reason), I do mind the pointless scope
creep and wish to highlight how little it actually used from the crate by
re-defining it as the single function.
We could also fork directories-next, or directories, and remove the usage of
option-ext per https://github.com/dirs-dev/dirs-sys-rs/issues/24, yet that'd be
a much larger task than what was done here.
In the future, it may be beneficial to submit a PR to wasmtime replacing
directories-next with home, a cargo-team maintained library to get the home
directory and associated folders. An example migration can be found at
https://github.com/harryfei/which-rs/pull/80.
