featureflag: bump Elixir and Erlang/OTP versions in docker image

This was blocked by a failure in featureflag dependency
tls_certificate_check on OTP-25. This was fixed in 1.17.4 and
featureflag service has been bumped to use that version.

src/featureflagservice/Dockerfile

@@ -10,11 +10,11 @@
 #   - https://hub.docker.com/r/hexpm/elixir/tags - for the build image
 #   - https://hub.docker.com/_/debian?tab=tags&page=1&name=bullseye-20210902-slim - for the release image
 #   - https://pkgs.org/ - resource for finding needed packages
-#   - Ex: hexpm/elixir:1.13.3-erlang-25.0-debian-bullseye-20210902-slim
+#   - Ex: hexpm/elixir:1.14.3-erlang-25.2.3-debian-buster-20230202-slim
 #
-ARG ELIXIR_VERSION=1.13.3
-ARG OTP_VERSION=23.0
-ARG DEBIAN_VERSION=bullseye-20210902-slim
+ARG ELIXIR_VERSION=1.14.3
+ARG OTP_VERSION=25.2.3
+ARG DEBIAN_VERSION=buster-20230202-slim
 
 ARG BUILDER_IMAGE="hexpm/elixir:${ELIXIR_VERSION}-erlang-${OTP_VERSION}-debian-${DEBIAN_VERSION}"
 ARG RUNNER_IMAGE="debian:${DEBIAN_VERSION}"