release: cargo-binstall v0.18.1

[github-actions]

This is a release PR for cargo-binstall version 0.18.1 (performing a patch bump).

Use squash merge.

Upon merging, this will automatically create the tag v0.18.1, build the CLI, and create a GitHub release with the release notes below.
You will still need to manually publish the cargo crate:

$ git switch main
$ git pull
$ git switch --detach v0.18.1
$ cargo publish -p cargo-binstall

To trigger builds initially, close and then immediately re-open this PR once.

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Edit release notes into the section below:

Release notes

Binstall is a tool to fetch and install Rust-based executables as binaries. It aims to be a drop-in replacement for cargo install in most cases. Install it today with cargo install cargo-binstall, from the binaries below, or if you already have it, upgrade with cargo binstall cargo-binstall.

Other changes:

• Fix running prebuilt binaries on ubuntu 20.04, docker image rust:1.65 or any environment that uses glibc 2.31 (Build -gnu targets on ubuntu-20.04 #607)