bump(ruby-lsp): update to v0.17.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ruby-lsp	0.17.7 -> 0.17.8

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Release Notes

Shopify/ruby-lsp (ruby-lsp)

v0.17.8

v0.17.8

✨ Enhancements

• Unify ruby-lsp-doctor with ruby-lsp command (https://github.com/Shopify/ruby-lsp/pull/2310) by @​andyw8
• Migrate indexing configuration to editor settings (https://github.com/Shopify/ruby-lsp/pull/2300) by @​vinistock
• Add keywords to completion candidates (https://github.com/Shopify/ruby-lsp/pull/2317) by @​st0012

🐛 Bug Fixes

• Fix top level namespace declaration indexing (https://github.com/Shopify/ruby-lsp/pull/2297) by @​vinistock
• Handle documents being deleted before processing their requests (https://github.com/Shopify/ruby-lsp/pull/2313) by @​vinistock
• Rescue NonExistingDocumentError in base server (https://github.com/Shopify/ruby-lsp/pull/2331) by @​vinistock

📦 Other Changes

• Document new indexing configuration approach (https://github.com/Shopify/ruby-lsp/pull/2319) by @​andyw8

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