Add lax no cover to both arms of tomllib version-gate

The else arm had it; the if arm did not, so on 3.10 the unreachable
import tomllib line counted as a miss.

Author: maxisbey

tests/examples/conftest.py

@@ -32,7 +32,7 @@
 from mcp.shared.version import LATEST_MODERN_VERSION
 from tests.interaction.transports._bridge import StreamingASGITransport
 
-if sys.version_info >= (3, 11):
+if sys.version_info >= (3, 11):  # pragma: lax no cover
     import tomllib
 else:  # pragma: lax no cover
     import tomli as tomllib