Use Rust 1.97.1 to compile on Windows

[skejserjensen]

This PR specifies a specific Rust version to use to avoid Rust 1.98.0, as it segfaults on Microsoft Windows when running our tests. @CGodiksen verified that it also happens with main and not just #424 and #425, so it seems to be a problem with Rust 1.98.0. I have not verified what causes this segfault, but it may be this issue rust-lang/rust#161441 as it was introduced in Rust 1.98.0 and should be a near guaranteed segfault according to the comments.

[Copilot]

Pull request overview

This PR pins the repository to Rust 1.97.1 to avoid test segfaults observed on Microsoft Windows with Rust 1.98.0, and updates user documentation accordingly.

Changes:

• Added rust-toolchain.toml to pin the toolchain to Rust 1.97.1 (with a minimal profile and clippy).
• Updated the user installation guide to reference Rust 1.97.1 instead of “latest stable”.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
rust-toolchain.toml	Pins the repo’s Rust toolchain to 1.97.1 to avoid Windows segfaults on 1.98.0.
docs/user/README.md	Updates installation instructions to reflect the pinned Rust version.

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[workingjubilee]

You can use https://github.com/rust-lang/cargo-bisect-rustc to attempt to identify the nightly that caused the issue. It does not require detailed knowledge of what is going wrong, only a test script that can reproduce the issue.

[skejserjensen]

You can use https://github.com/rust-lang/cargo-bisect-rustc to attempt to identify the nightly that caused the issue. It does not require detailed knowledge of what is going wrong, only a test script that can reproduce the issue.

Thank you for the information. I will try to set up a machine with Microsoft Windows and try running our tests with the nightlies between Rust 1.97.1 and Rust 1.98.0 to determine when it starts failing.