Bump elixir from 1.15 to 1.16 (#3595)

Bumps elixir from 1.15 to 1.16.

---
updated-dependencies:
- dependency-name: elixir
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Dockerfile

@@ -1,4 +1,4 @@
-FROM elixir:1.15 AS builder
+FROM elixir:1.16 AS builder
 
 SHELL ["/bin/bash", "-o", "pipefail", "-c"]