Suppress Interrupt exception for LSP

[koic]

This PR suppresses the following backtrace of Interrupt exception for LSP:

Before

$ bundle exec rubocop --lsp
^C/Users/koic/.rbenv/versions/3.4-dev/lib/ruby/gems/3.4.0+0/gems/language_server-protocol-3.17.0.3/
lib/language_server/protocol/transport/io/reader.rb:16:in 'IO#gets': Interrupt
from /Users/koic/.rbenv/versions/3.4-dev/lib/ruby/gems/3.4.0+0/gems/language_server-protocol-3.17.0.3/
lib/language_server/protocol/transport/io/reader.rb:16:in 'LanguageServer::Protocol::Transport::Io::Reader#read'
        from /Users/koic/src/github.com/rubocop/rubocop/lib/rubocop/lsp/server.rb:35:in 'RuboCop::LSP::Server#start'
(snip)

After

$ bundle exec rubocop --lsp
^C
Exiting...

---

Before submitting the PR make sure the following are checked:

• The PR relates to only one subject with a clear title and description in grammatically correct, complete sentences.
• Wrote good commit messages.
• Commit message starts with [Fix #issue-number] (if the related issue exists).
• Feature branch is up-to-date with master (if not - rebase it).
• Squashed related commits together.
• Added tests.
• Ran bundle exec rake default. It executes all tests and runs RuboCop on its own code.
• Added an entry (file) to the changelog folder named {change_type}_{change_description}.md if the new code introduces user-observable changes. See changelog entry format for details.