CI: Bump lint stage to elixir-1.12

Elixir 1.12 changed formatting rules, this allows to avoid having to rollback to run `mix format`

test/support/api_spec_helpers.ex

@@ -29,9 +29,7 @@ defmodule Pleroma.Tests.ApiSpecHelpers do
           end)
 
         flunk(
-          "Value does not conform to schema #{schema.title}: #{Enum.join(errors, "\n")}\n#{
-            inspect(value)
-          }"
+          "Value does not conform to schema #{schema.title}: #{Enum.join(errors, "\n")}\n#{inspect(value)}"
         )
     end
   end

test/support/conn_case.ex

@@ -102,9 +102,7 @@ defmodule Pleroma.Web.ConnCase do
               end)
 
             flunk(
-              "Response does not conform to schema of #{op_id} operation: #{
-                Enum.join(errors, "\n")
-              }\n#{inspect(json)}"
+              "Response does not conform to schema of #{op_id} operation: #{Enum.join(errors, "\n")}\n#{inspect(json)}"
             )
         end
       end

test/support/http_request_mock.ex

@@ -1313,9 +1313,7 @@ defmodule HttpRequestMock do
 
   def get(url, query, body, headers) do
     {:error,
-     "Mock response not implemented for GET #{inspect(url)}, #{query}, #{inspect(body)}, #{
-       inspect(headers)
-     }"}
+     "Mock response not implemented for GET #{inspect(url)}, #{query}, #{inspect(body)}, #{inspect(headers)}"}
   end
 
   # POST Requests
@@ -1381,9 +1379,7 @@ defmodule HttpRequestMock do
 
   def post(url, query, body, headers) do
     {:error,
-     "Mock response not implemented for POST #{inspect(url)}, #{query}, #{inspect(body)}, #{
-       inspect(headers)
-     }"}
+     "Mock response not implemented for POST #{inspect(url)}, #{query}, #{inspect(body)}, #{inspect(headers)}"}
   end
 
   # Most of the rich media mocks are missing HEAD requests, so we just return 404.
@@ -1398,8 +1394,6 @@ defmodule HttpRequestMock do
 
   def head(url, query, body, headers) do
     {:error,
-     "Mock response not implemented for HEAD #{inspect(url)}, #{query}, #{inspect(body)}, #{
-       inspect(headers)
-     }"}
+     "Mock response not implemented for HEAD #{inspect(url)}, #{query}, #{inspect(body)}, #{inspect(headers)}"}
   end
 end