Fix installation instructions for linter

[cmichi]

When I ran cargo contract build on a fresh machine it gave me this error:

 [==] Checking ink! linting rules
ERROR: Toolchain `nightly-2023-12-28` was not found!
This specific version is required to provide additional source code analysis.


You can install it by executing `rustup install nightly-2023-12-28`.

After executing this command it didn't work:

 [==] Checking ink! linting rules
    Updating git repository `https://github.com/paritytech/ink/`
    Updating git repository `https://github.com/paritytech/ink/`
Error: command failed: cd "/var/folders/s5/5gcp8ck95k39z006fj059_0c0000gn/T/.tmpaq9hjY" && RUSTFLAGS="-C link-args=-Wl,-rpath,/Users/michi/.rustup/toolchains/nightly-2023-12-28-aarch64-apple-darwin/lib" "cargo" "build"
ERROR: command ["/Users/michi/.rustup/toolchains/stable-aarch64-apple-darwin/bin/cargo", "dylint", "--quiet", "--lib=ink_linting_mandatory", "--lib=ink_linting", "--", "--target=wasm32-unknown-unknown", "-Zbuild-std=core,alloc", "--no-default-features"] exited with code 1

I then executed cargo install cargo-dylint dylint-link and got another error:

 [==] Checking ink! linting rules
    Updating git repository `https://github.com/paritytech/ink/`
    Updating git repository `https://github.com/paritytech/ink/`
Checking with toolchain `nightly-2023-12-28-aarch64-apple-darwin`
error: "/Users/michi/.rustup/toolchains/nightly-2023-12-28-aarch64-apple-darwin/lib/rustlib/src/rust/Cargo.lock" does not exist, unable to build with the standard library, try:
        rustup component add rust-src --toolchain nightly-2023-12-28-aarch64-apple-darwin
Error: Compilation failed with toolchain `nightly-2023-12-28-aarch64-apple-darwin`

Caused by:
    command failed: env -u CARGO -u RUSTC CLIPPY_DISABLE_DOCS_LINKS="null" DYLINT_LIBS="[\"/Users/michi/projects/ink/integration-tests/flipper/target/ink/dylint/libraries/nightly-2023-12-28-aarch64-apple-darwin/release/libink_linting@nightly-2023-12-28-aarch64-apple-darwin.dylib\",\"/Users/michi/projects/ink/integration-tests/flipper/target/ink/dylint/libraries/nightly-2023-12-28-aarch64-apple-darwin/release/libink_linting_mandatory@nightly-2023-12-28-aarch64-apple-darwin.dylib\"]" DYLINT_METADATA="{\"libraries\":[{\"git\":\"https://github.com/paritytech/ink/\",\"pattern\":\"linting/mandatory\",\"rev\":\"b6880dd9384e09ec4e7ad65453cd844113e8a316\"},{\"git\":\"https://github.com/paritytech/ink/\",\"pattern\":\"linting/extra\",\"rev\":\"b6880dd9384e09ec4e7ad65453cd844113e8a316\"}]}" DYLINT_NO_DEPS="0" RUSTC_WORKSPACE_WRAPPER="/Users/michi/.dylint_drivers/nightly-2023-12-28-aarch64-apple-darwin/dylint-driver" RUSTUP_TOOLCHAIN="nightly-2023-12-28-aarch64-apple-darwin" "cargo" "check" "--target-dir" "/Users/michi/projects/ink/integration-tests/flipper/target/ink/dylint/target/nightly-2023-12-28-aarch64-apple-darwin" "--target=wasm32-unknown-unknown" "-Zbuild-std=core,alloc" "--no-default-features"
ERROR: command ["/Users/michi/.rustup/toolchains/stable-aarch64-apple-darwin/bin/cargo", "dylint", "--quiet", "--lib=ink_linting_mandatory", "--lib=ink_linting", "--", "--target=wasm32-unknown-unknown", "-Zbuild-std=core,alloc", "--no-default-features"] exited with code 1

After executing rustup component add rust-src --toolchain nightly-2023-12-28-aarch64-apple-darwin it worked.

I saw that the code already checks for cargo-dylint and dylint-link, so not sure why my cargo install changed fix. Maybe because of an updated crate after the install?

Here's what the command did:

Ignored package `dylint-link v2.1.10` is already installed, use --force to override
Replaced package `cargo-dylint v2.5.0` with `cargo-dylint v2.6.1` (executable `cargo-dylint`)

Please

• add rustup component add rust-src --toolchain nightly-2023-12-28 to the toolchain installation instructions
• try to find out what the reason for the cargo install cargo-dylint dylint-link thing could be.

Please also check if ink-docs or the readme in cargo-contract need to be adapted.

[jubnzv]

I updated the installation instructions suggested by cargo-contract and README in #1546.

Please also check if ink-docs or the readme in cargo-contract need to be adapted.

I replaced cargo install with rustup run $TOOLCHAIN_VERSION cargo install in the documentation just for the case: use-ink/ink-docs#335