feat: upgrade elixir runtimes and dependencies (#78)

Upgrade [elixir][0] runtime from [1.16.2 to 1.16.3][1].

Also, [upgrade application dependencies][2]:

* `ecto_sql` from 3.11.1 to 3.11.2
* `phoenix_ecto` from 4.6.0 to 4.6.1
* `postgrex` from 0.17.5 to 0.18.0

Reviewed-on: #78

[0]: https://github.com/elixir-lang/elixir/releases/tag/v1.16.3
[1]: https://github.com/elixir-lang/elixir/compare/v1.16.2...v1.16.3
[2]: https://diff.hex.pm/diffs?diffs[]=ecto_sql:3.11.1:3.11.2&diffs[]=phoenix_ecto:4.6.0:4.6.1&diffs[]=postgrex:0.17.5:0.18.0
Co-authored-by: Joao P Dubas <joao.dubas+gitea@gmail.com>
Co-committed-by: Joao P Dubas <joao.dubas+gitea@gmail.com>

.drone.yml

@@ -37,7 +37,7 @@ steps:
       restore: true
 
   - name: test
-    image: 'hexpm/elixir:1.16.2-erlang-26.2.5-debian-bookworm-20240513-slim'
+    image: 'hexpm/elixir:1.16.3-erlang-26.2.5-debian-bookworm-20240513-slim'
     environment:
       MIX_ENV: test
       POSTGRES_HOST: &db_host db
@@ -105,7 +105,7 @@ steps:
       restore: true
 
   - name: compile app
-    image: &elixir 'hexpm/elixir:1.16.2-erlang-26.2.5-debian-bookworm-20240513-slim'
+    image: &elixir 'hexpm/elixir:1.16.3-erlang-26.2.5-debian-bookworm-20240513-slim'
     commands:
       - mix do local.rebar --force, local.hex --force, deps.get, deps.compile
       - mix compile --all-warnings --warnings-as-errors