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

warning: a struct for OpenApiSpex.Cast.Error is expected on struct update:

        %OpenApiSpex.Cast.Error{err | name: err.value}

    but got type:

        dynamic(%{..., name: nil, reason: :invalid_enum})

    where "err" was given the type:

        # type: dynamic(%{..., name: nil, reason: :invalid_enum})
        # from: lib/pleroma/web/api_spec/render_error.ex:20:45
        %{name: nil, reason: :invalid_enum} = err

    when defining the variable "err", you must also pattern match on "%OpenApiSpex.Cast.Error{}".

    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:
    │
 21 │           %OpenApiSpex.Cast.Error{err | name: err.value}
    │           ~
    │
    └─ lib/pleroma/web/api_spec/render_error.ex:21:11: Pleroma.Web.ApiSpec.RenderError.call/2

lib/pleroma/web/api_spec/render_error.ex

@@ -17,10 +17,10 @@ defmodule Pleroma.Web.ApiSpec.RenderError do
   def call(conn, errors) do
     errors =
       Enum.map(errors, fn
-        %{name: nil, reason: :invalid_enum} = err ->
+        %OpenApiSpex.Cast.Error{name: nil, reason: :invalid_enum} = err ->
           %OpenApiSpex.Cast.Error{err | name: err.value}
 
-        %{name: nil} = err ->
+        %OpenApiSpex.Cast.Error{name: nil} = err ->
           %OpenApiSpex.Cast.Error{err | name: List.last(err.path)}
 
         err ->