fix: Compiler warnings for zero-arity funtion calls

[TylerPachal]

Calling a function without the parenthesis () is a compiler warning in newer versions of Elixir.

This is the stacktrace I am seeing in my project:

warning: using map.field notation (without parentheses) to invoke function MyProjWeb.MyView.type() is deprecated, you must add parentheses instead: remote.function()
  (jsonapi 1.8.1) lib/jsonapi/plugs/query_parser.ex:299: JSONAPI.QueryParser.field_valid_for_relationship?/2
  (elixir 1.17.3) lib/enum.ex:4315: Enum.find_list/3
  (jsonapi 1.8.1) lib/jsonapi/plugs/query_parser.ex:288: JSONAPI.QueryParser.get_view_for_type/2
  (jsonapi 1.8.1) lib/jsonapi/plugs/query_parser.ex:282: JSONAPI.QueryParser.get_valid_fields_for_type/2
  (jsonapi 1.8.1) lib/jsonapi/plugs/query_parser.ex:140: anonymous fn/3 in JSONAPI.QueryParser.parse_fields/2
  (stdlib 4.3.1.4) maps.erl:411: :maps.fold_1/3
  (jsonapi 1.8.1) lib/jsonapi/plugs/query_parser.ex:102: JSONAPI.QueryParser.call/2
  (myproj 0.1.0) lib/signal_web/controllersmy_controller.ex:1: MyProjWeb.MyController.phoenix_controller_pipeline/2
  (phoenix 1.7.14) lib/phoenix/router.ex:484: Phoenix.Router.__call__/5
  (signal 0.1.0) lib/signal_web/endpoint.ex:1: SignalWeb.Endpoint.plug_builder_call/2
  (signal 0.1.0) lib/signal_web/endpoint.ex:1: SignalWeb.Endpoint."call (overridable 3)"/2
  (signal 0.1.0) lib/signal_web/endpoint.ex:1: SignalWeb.Endpoint.call/2
  (phoenix 1.7.14) lib/phoenix/test/conn_test.ex:225: Phoenix.ConnTest.dispatch/5
  (ex_unit 1.17.3) lib/ex_unit/runner.ex:485: ExUnit.Runner.exec_test/2
  (ex_unit 1.17.3) lib/ex_unit/capture_log.ex:113: ExUnit.CaptureLog.with_log/2
  (ex_unit 1.17.3) lib/ex_unit/runner.ex:434: anonymous fn/3 in ExUnit.Runner.maybe_capture_log/3

This PR fixes the calls to zero-arity functions and fixes the compiler warnings 👍

[TylerPachal]

I am not sure what the problem is with the Dialyzer and Credo checks. No deps were changed in this PR.

[mattpolzin]

This should be fixed hopefully if you rebase or merge with main: #336

[TylerPachal]

Thanks @mattpolzin, everything is passing now 👍