Bump ruby from 3.1.1-alpine3.15 to 3.1.2-alpine3.15

Bumps ruby from 3.1.1-alpine3.15 to 3.1.2-alpine3.15.

---
updated-dependencies:
- dependency-name: ruby
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Dockerfile

@@ -1,5 +1,5 @@
 # Official verified image
-FROM ruby:3.1.1-alpine3.15
+FROM ruby:3.1.2-alpine3.15
 
 # Remote git repository <-> Remote container registry
 LABEL org.opencontainers.image.source https://github.com/noraj/haiti