Update ruby-lsp requirement from ~> 0.24.1 to ~> 0.26.6

Updates the requirements on [ruby-lsp](https://github.com/Shopify/ruby-lsp) to permit the latest version.
- [Release notes](https://github.com/Shopify/ruby-lsp/releases)
- [Commits](Shopify/ruby-lsp@v0.24.1...v0.26.6)

---
updated-dependencies:
- dependency-name: ruby-lsp
  dependency-version: 0.26.6
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Gemfile

@@ -9,5 +9,5 @@ gem 'rake', '~> 13.2', group: :development
 
 gem 'rspec', '~> 3.13', group: :development
 gem 'rubocop', '~> 1.75', group: :development
-gem 'ruby-lsp', '~> 0.24.1', group: :development
+gem 'ruby-lsp', '~> 0.26.6', group: :development
 gem 'sqlite3', '~> 2.6', group: :development