deps: Update ruby Docker tag to v4 #13

Closed
renovate-bot wants to merge 1 commit from renovate/ruby-4.x into main

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@ -1,4 +1,4 @@
FROM ruby:3.4-slim-bookworm
FROM ruby:4.0-slim-bookworm
RUN apt-get update && apt-get install -y --no-install-recommends \
build-essential \