rust toolchain update seems soon necessary

[clangenb]

I tried to check if I can integrate the parachain runtime instead of the solo node runtime, and I got the following error:

error: package `clap_lex v0.5.1` cannot be built because it requires rustc 1.70.0 or newer, while the currently active rustc version is 1.66.0-nightly
Either upgrade to rustc 1.70.0 or newer, or use
cargo update -p [email protected] --precise ver
where `ver` is the latest version of `clap_lex` supporting rustc 1.66.0-nightly
make: *** [Makefile:174: bin/app] Error 101       

This means that the time is running out with this toolchain. (Additionally, I can't try to fix the parachain node import by using another runtime..., see #1449)

[clangenb]

Downgrading clap to v4.0.9 is still possible and resolves the issue after incorporating the parachain runtime.

[Kailai-Wang]

But AFAIU we highly rely on the upstream (https://github.com/apache/incubator-teaclave-sgx-sdk) dep updates, don't we?

[clangenb]

Yes, they are most of the time the bottleneck when it comes to that. We have made them aware:

• Next rustc-toolchain update? apache/incubator-teaclave-sgx-sdk#445

[brenzi]

it seems we'll now need at least rustc 1.70
channel = "nightly-2023-06-01"
this is a blocker now.
alternative is to upgrade teaclave sdk to 2.0.0 (which isn't officially released yet) - and likely means quite some work