Bump hexpm/elixir

Bumps hexpm/elixir from 1.15.4-erlang-26.0.2-alpine-3.18.2 to 1.15.5-erlang-26.0.2-alpine-3.18.2.

---
updated-dependencies:
- dependency-name: hexpm/elixir
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Dockerfile

@@ -4,7 +4,7 @@
 
 # NOTE: make sure these versions match in .github/workflows/elixir.yml and .tool-versions
 # NOTE: make sure the alpine version matches down below
-FROM docker.io/hexpm/elixir:1.15.4-erlang-26.0.2-alpine-3.18.2 AS elixir-builder
+FROM docker.io/hexpm/elixir:1.15.5-erlang-26.0.2-alpine-3.18.2 AS elixir-builder
 
 ARG MIX_ENV=prod