Update Rust crate syntect to 5.1.0 - autoclosed

This MR contains the following updates:

Package	Type	Update	Change
syntect	dependencies	minor	5.0.0 -> 5.1.0

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Release Notes

trishume/syntect (syntect)

v5.1.0

Compare Source

Improvements

• Fix how syntect::util::split_at() handles multi-byte characters
• Allow case insensitive search for .tmtheme paths
• impl PartialEq for Theme

Dependencies

• Upgrade fancy-regex to 0.11
• Upgrade regex-syntax to 0.7
• Replace lazy_static with once_cell

Other

• Change MSRV policy to "last three stable versions"
• Make Debug impl of syntect::highlighting::Color less verbose

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