fix: avoid soft-deprecated warning logs when compiling tesla itself

[entertainyou]

Tesla generates a soft-deprecated warning log when it is compiled as a dependency.

[yordis]

@entertainyou can you share under what conditions this happened? Also notice that CI is failing

[entertainyou]

@yordis This is to fix warning log when tesla is compiled, you can reproduce by run mix compile in this simple mix repository https://github.com/entertainyou/tesla_warning_repo , the repository is a very simple mix project with tesla as a dependency.

==> tesla
Compiling 40 files (.ex)
warning: `use Tesla.Builder` and `use Tesla` are soft-deprecated. It will be removed in future major version in favor of
Runtime Configuration instead. Please share your feedback at https://github.com/elixir-tesla/tesla/discussions/732

If you can turn off this warning, add the following to your config.exs:

```elixir
config :tesla, disable_deprecated_builder_warning: true
```

  lib/tesla/builder.ex:9: Tesla.Builder."MACRO-__using__"/2
  (elixir 1.19.5) src/elixir_dispatch.erl:257: :elixir_dispatch.expand_macro_fun/7
  (elixir 1.19.5) src/elixir_dispatch.erl:149: :elixir_dispatch.dispatch_require/7
  (elixir 1.19.5) src/elixir_expand.erl:636: :elixir_expand.expand_block/5
  (elixir 1.19.5) src/elixir_expand.erl:52: :elixir_expand.expand/3
  (elixir 1.19.5) src/elixir_dispatch.erl:271: :elixir_dispatch.expand_quoted/7

[entertainyou]

I think CI failed because of the commit message. I've updated the commit message .

[yordis]

Oooooh 😄

[yordis]

Why CI is failing? 😭