Bump ruby from 2.7 to 3.0.0

Bumps ruby from 2.7 to 3.0.0.

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

Author: dependabot-preview[bot]

Dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:2.7
+FROM ruby:3.0.0
 COPY ./ /usr/src/app/
 WORKDIR /usr/src/app