[dependabot:docker] bump ruby from 3.3.8-alpine3.21 to 3.4.5-alpine3.21

Bumps ruby from 3.3.8-alpine3.21 to 3.4.5-alpine3.21.

---
updated-dependencies:
- dependency-name: ruby
  dependency-version: 3.4.5-alpine3.21
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:3.3.8-alpine3.21 AS base
+FROM ruby:3.4.5-alpine3.21 AS base
 
 RUN apk add git --no-cache