Update rust-toolchain to toml format #3323
Merged
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Previously the rust-toolchain file was using the legacy one line toolchain version format from https://rust-lang.github.io/rustup/overrides.html#the-toolchain-file. Now the rust-toolchain file uses toml format and updates the nightly version to the last nightly that contained 1.68.
Motivation
Dependabot has been updated to only read the toml format of the rust-toolchain file.
Keeping the changes targeted on the dependabot fix, the rust-toolchain file was not renamed to the newer
rust-toolchain.toml
.The nightly version was bumped to the last nightly that was 1.68. This was to bring in the https/sparse crates.io logic that came in 1.68 which dependabot relies on for 1.68 toolchain versions. This was only moved a little to minimize other clippy and format changes that might be needed.
For reference the nightly dates and version transitions:
2023-01-04 was the previous nightly version used.