Update ruby:3.4.2 Docker digest to d780a9b (#2047)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| ruby | final | digest | `b6c3947` -> `d780a9b` |

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gcp-ts-k8s-ruby-on-rails-postgresql/app/Dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:3.4.2@sha256:b6c3947ee95eb6bea5e331ac288beb2a48b98bb30d15353b6c5ffe2482828572
+FROM ruby:3.4.2@sha256:d780a9b44dc5e57a4968d3e4b086bbdd9b595f06d747da10b29e568386fe1dd9
 RUN apt-get update -qq && apt-get install -y build-essential libpq-dev nodejs
 RUN mkdir /myapp
 WORKDIR /myapp