Bump ruby from 249c66b to 60d292b (dart-lang#5039)

Bumps ruby from `249c66b` to `60d292b`.


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Dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:3.2-slim-bookworm@sha256:249c66b933130178c8fe890d56568d680e9b3c93e7906b87e4e63bee2209a6d5 as base
+FROM ruby:3.2-slim-bookworm@sha256:56ce8d5a3b6624aef15b34db047ef7b4ddb0e95bd41b4b608c623be9eedd6e1c as base
 
 ENV DEBIAN_FRONTEND=noninteractive
 ENV TZ=US/Pacific