Update ruby-lsp-rails to 0.3.1

What does this MR do and why?

Update ruby-lsp-rails to 0.3.1. This is a development dependency that is used to support IDEs using ruby-lsp.

This fixes a race condition that can lead to runaway CPU usage by zombie server processes

See https://github.com/Shopify/ruby-lsp-rails/pull/270

Changes: https://github.com/Shopify/ruby-lsp-rails/releases/tag/v0.3.1

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