Add pragma to suppress TYPE_CHECKING import warning

Author: Евгений Блинов

microbenchmark/scenario.py

@@ -7,7 +7,7 @@
 
 from microbenchmark.benchmark_result import BenchmarkResult
 
-if TYPE_CHECKING:
+if TYPE_CHECKING:  # pragma: no cover
     from microbenchmark.scenario_group import ScenarioGroup