Remove -vv for pytest

Apply the matching migration step to this repository so its own
`pyproject.toml` no longer ships `addopts = "-vv"` under
`[tool.pytest.ini_options]`.

Signed-off-by: Leandro Lucarella <luca-frequenz@llucax.com>

Author: llucax

pyproject.toml

@@ -212,7 +212,6 @@ module = [
 ignore_missing_imports = true
 
 [tool.pytest.ini_options]
-addopts = "-vv"
 filterwarnings = [
   "error",
   "once::DeprecationWarning",