[CI] Update Rust nightly version for CI

[davxy]

CI pipeline job is failing because cargo nightly is not up to date.

$ cargo --version
cargo 1.73.0 (9c4383fb5 2023-08-26)
...
$ cargo +nightly --version
cargo 1.71.0-nightly (09276c703 2023-05-16)

[davxy]

cc @paritytech/ci

[ggwpez]

Are you trying to use nightly features in Rust code? We do not use nightly for building, only formatting.

[davxy]

Not me. Is the CI that is trying to use nightly. https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/jobs/4160212
It is using it to build a wasm artifact

[2023-11-01 11:45:55]   Executing build command: CARGO_TARGET_DIR="/builds/parity/mirrors/polkadot-sdk/target/debug/wbuild/node-template-runtime/target" RUSTFLAGS="-C target-cpu=mvp -C target-feature=-sign-ext -C link-arg=--export-table -Clink-arg=--export=__heap_base -C link-arg=--import-memory  " SKIP_WASM_BUILD="" "/usr/local/rustup/toolchains/nightly-2023-05-23-x86_64-unknown-linux-gnu/bin/cargo" "rustc" "--target=wasm32-unknown-unknown" "--manifest-path=/builds/parity/mirrors/polkadot-sdk/target/debug/wbuild/node-template-runtime/Cargo.toml" "--color=always" "--profile" "release"
[2023-11-01 11:45:55]   Using rustc version: rustc 1.71.0-nightly (8b4b20836 2023-05-22)

[davxy]

Are you trying to use nightly features in Rust code? We do not use nightly for building, only formatting.

Or maybe your question was if my code is using anything that is available on nightly only :-)
Sorry if I misunderstood.

My code is using a feature <integer>::div_ceil which is stable since 1.73

[davxy]

Closed by #2115