chore(deps): update ruby docker tag to v3.4.7 (#2756)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

ci/images/debian/Dockerfile.ruby34

@@ -1,5 +1,5 @@
 # Base-image
-FROM ruby:3.4.6-slim-trixie AS base
+FROM ruby:3.4.7-slim-trixie@sha256:2de50c072bed1bdaf5e6b6c132fb2bc56f03700046ad95a515b4111203bf5034 AS base
 
 ARG DEBIAN_REPO
 ARG GITHUB_RAW_URL=https://raw.githubusercontent.com