Elixir 1.19: Fix typing violation on struct updates in Web.ApiSpec.Cast*

warning: a struct for Plug.Conn is expected on struct update:

         %Plug.Conn{conn | query_params: query_params}

     but got type:

         dynamic()

     where "conn" was given the type:

         # type: dynamic()
         # from: lib/pleroma/web/api_spec/cast_and_validate.ex:109:43
         conn

     when defining the variable "conn", you must also pattern match on "%Plug.Conn{}".

     hint: given pattern matching is enough to catch typing errors, you may optionally convert the struct update into a map update. For example, instead of:

         user = some_function()
         %User{user | name: "John Doe"}

     it is enough to write:

         %User{} = user = some_function()
         %{user | name: "John Doe"}

     typing violation found at:
     │
 133 │         conn = %Conn{conn | query_params: query_params}
     │                ~
     │
     └─ lib/pleroma/web/api_spec/cast_and_validate.ex:133:16: Pleroma.Web.ApiSpec.CastAndValidate.cast_and_validate/6

lib/pleroma/web/api_spec/cast_and_validate.ex

@@ -106,7 +106,7 @@ defmodule Pleroma.Web.ApiSpec.CastAndValidate do
     OpenApiSpex.cast_and_validate(spec, operation, conn, content_type, cast_opts)
   end
 
-  defp cast_and_validate(spec, operation, conn, content_type, false = _strict, cast_opts) do
+  defp cast_and_validate(spec, operation, %Conn{} = conn, content_type, false = _strict, cast_opts) do
     case OpenApiSpex.cast_and_validate(spec, operation, conn, content_type) do
       {:ok, conn} ->
         {:ok, conn}