Update language server and dependencies

[turbolent]

Description

This enables features like renaming.

Quickfixes don't work yet, and I couldn't figure out why.

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For contributor use:

• Targeted PR against correct branch (see CONTRIBUTING.md)
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the standards mentioned here.
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

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