Fixes the data type of the expected_size variable #179

Job	Run time
📦 Build the source distribution	15s
📦 Publish to PyPI	0s
Tests on 3.8	6m 18s
Tests for Kafka 0.8.2.2	6h 0m 15s
Tests on 3.9	5m 31s
Tests for Kafka 0.9.0.1	2m 48s
Tests on 3.10	6m 19s
Tests for Kafka 0.10.2.2	3m 54s
Tests on 3.11	5m 38s
Tests for Kafka 0.11.0.2	4m 58s
Tests on 3.12	5m 52s
Tests for Kafka 0.11.0.3	5m 4s
Tests on pypy3.9	8m 23s
Tests for Kafka 1.1.1	6m 35s
Tests on ~3.13.0-0	2m 12s
Tests for Kafka 2.4.0	5m 56s
Tests for Kafka 2.5.0	5m 55s
Tests for Kafka 2.6.0	6m 41s
✅ Ensure the required checks passing	3s
	7h 22m 37s

Provide feedback