Bump CRuby images to latest

- Debian Buster goes bust on 2024-06-30, move to latest, which is either
  bullseye or bookworm. Sadly there is no 2.5.9-bullseye, so breakage is
  to be expected.
- Also bump to latest CRuby `TEENY` versions for each one.

.circleci/images/primary/Dockerfile-2.7.6

@@ -1,6 +1,6 @@
 # Note: See the "Publishing updates to images" note in ./README.md for how to publish new builds of this container image
 
-FROM ruby:2.7.6
+FROM ruby:2.7.8-bullseye
 
 # Make apt non-interactive
 RUN echo 'APT::Get::Assume-Yes "true";' > /etc/apt/apt.conf.d/90circleci \

.circleci/images/primary/Dockerfile-3.0.4

@@ -1,6 +1,6 @@
 # Note: See the "Publishing updates to images" note in ./README.md for how to publish new builds of this container image
 
-FROM ruby:3.0.4-bullseye
+FROM ruby:3.0.7-bullseye
 
 # Make apt non-interactive
 RUN echo 'APT::Get::Assume-Yes "true";' > /etc/apt/apt.conf.d/90circleci \

.circleci/images/primary/Dockerfile-3.1.2

@@ -1,6 +1,6 @@
 # Note: See the "Publishing updates to images" note in ./README.md for how to publish new builds of this container image
 
-FROM ruby:3.1.2-bullseye
+FROM ruby:3.1.6-bookworm
 
 # Make apt non-interactive
 RUN echo 'APT::Get::Assume-Yes "true";' > /etc/apt/apt.conf.d/90circleci \

.circleci/images/primary/Dockerfile-3.2.0

@@ -1,6 +1,6 @@
 # Note: See the "Publishing updates to images" note in ./README.md for how to publish new builds of this container image
 
-FROM ruby:3.2.0-bullseye
+FROM ruby:3.2.4-bookworm
 
 # Make apt non-interactive
 RUN echo 'APT::Get::Assume-Yes "true";' > /etc/apt/apt.conf.d/90circleci \

.circleci/images/primary/Dockerfile-3.3.0

@@ -1,6 +1,6 @@
 # Note: See the "Publishing updates to images" note in ./README.md for how to publish new builds of this container image
 
-FROM ruby:3.3.0-bullseye
+FROM ruby:3.3.2-bookwork
 
 # Make apt non-interactive
 RUN echo 'APT::Get::Assume-Yes "true";' > /etc/apt/apt.conf.d/90circleci \