Update proto warnings (#187)

Author: flora-hofmann-frequenz

pyproject.toml

@@ -155,7 +155,15 @@ disable = [
 ]
 
 [tool.pytest.ini_options]
-addopts = "-W=all -Werror -Wdefault::DeprecationWarning -Wdefault::PendingDeprecationWarning -vv"
+addopts = "-vv"
+filterwarnings = [
+  "error",
+  "once::DeprecationWarning",
+  "once::PendingDeprecationWarning",
+  # We use a raw string (single quote) to avoid the need to escape special
+  # chars as this is a regex
+  'ignore:Protobuf gencode version .*exactly one major version older.*:UserWarning',
+]
 testpaths = ["tests", "src"]
 asyncio_mode = "auto"
 asyncio_default_fixture_loop_scope = "function"