Publishing s2n-quic-xdp crate fails due to MSRV

[jouho]

Problem:

When publishing the xdp crate, I get the following error:

ubuntu@:~/s2n-quic$ cargo publish --manifest-path tools/xdp/s2n-quic-xdp/Cargo.toml -p s2n-quic-xdp
    Updating crates.io index
   Packaging s2n-quic-xdp v0.52.0 (/home/ubuntu/s2n-quic/tools/xdp/s2n-quic-xdp)
   Verifying s2n-quic-xdp v0.52.0 (/home/ubuntu/s2n-quic/tools/xdp/s2n-quic-xdp)
    Updating crates.io index
error: failed to verify package tarball

Caused by:
  package `aya v0.13.1` cannot be built because it requires rustc 1.80.0 or newer, while the currently active rustc version is 1.74.1

This is because we set the publish version to use 1.80.0 rustc version:

s2n-quic/tools/xdp/rust-toolchain

Line 2 in 2f357d5

channel = "1.80.0"

Solution:

Upgrade MSRV to 1.80.0. This was overriding the rustc version used when publishing:

ubuntu@:~/s2n-quic$ rustup default 1.80.0
info: using existing install for '1.80.0-x86_64-unknown-linux-gnu'
info: default toolchain set to '1.80.0-x86_64-unknown-linux-gnu'

  1.80.0-x86_64-unknown-linux-gnu unchanged - rustc 1.80.0 (051478957 2024-07-21)

info: note that the toolchain '1.74.1-x86_64-unknown-linux-gnu' is currently in use (overridden by '/home/ubuntu/s2n-quic/rust-toolchain')

Upgrading MSRV to 1.80.0 also allows us to resolve #2334

Requirements / Acceptance Criteria:

Out of scope:

[camshaft]

When publishing, you need to pushd/popd into the crate directory instead of --manifest-dir. This will use the appropriate rust-toolchain:

https://github.com/aws/s2n-quic/blob/2f357d5f31bec6deff82ea8f29df095cfee6f026/tools/xdp/rust-toolchain#L2C6-L2C19