Update Rust toolchain version to 1.91.1

[cyu-12]

Description

Updates Rust version for new installs of Lodestone

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Note: make sure your files are formatted with rust-analyzer

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