chore: upgrade deps and match ci services to the ones used locally (#100)

Upgrade deps:

* `credo` from 1.7.7 to 1.7.8
* `dialyxir` from 1.4.3 to 1.4.4
* `plug_cowboy` from 2.7.1 to 2.7.2
* `postgrex` from 0.19.0 to 0.19.1

In `CI` match image versions:

* `postgres` from 16.4 to 17.0
* `erlang` from 27.0.1 to 27.1.1
* `elixir` from 1.17.2 to 1.17.3

Reviewed-on: #100
Co-authored-by: Joao P Dubas <joao.dubas+gitea@gmail.com>
Co-committed-by: Joao P Dubas <joao.dubas+gitea@gmail.com>

.drone.yml

@@ -9,7 +9,7 @@ trigger:
 
 steps:
   - name: database healthcheck
-    image: &postgres 'postgres:16.4-alpine'
+    image: &postgres 'postgres:17.0-alpine'
     environment:
       PGUSER: &db_user postgres
       PGPASSWORD: &db_pass postgres
@@ -44,7 +44,7 @@ steps:
         path: /drone/src/deps
 
   - name: dependencies and compile
-    image: &elixir 'hexpm/elixir:1.17.2-erlang-27.0.1-debian-bookworm-20240701-slim'
+    image: &elixir 'hexpm/elixir:1.17.3-erlang-27.1.1-debian-bookworm-20240926-slim'
     commands:
       - apt-get update
       - apt-get install -y git make