Bump actions/checkout from 3 to 4 #67

Job	Run time
📦 Build the source distribution	22s
Tests on 3.8	7m 26s
Tests on 3.9	6m 42s
Tests on 3.10	6m 39s
Tests on 3.11	6m 53s
Tests on pypy3.9	9m 52s
Tests on ~3.12.0-0	4m 27s
Tests for Kafka 0.8.2.2	3m 25s
Tests for Kafka 0.9.0.1	3m 25s
Tests for Kafka 0.10.2.2	3m 53s
Tests for Kafka 0.11.0.2	5m 58s
Tests for Kafka 0.11.0.3	5m 21s
Tests for Kafka 1.1.1	5m 32s
Tests for Kafka 2.4.0	7m 31s
Tests for Kafka 2.5.0	6m 45s
Tests for Kafka 2.6.0	7m 11s
✅ Ensure the required checks passing	3s
	1h 31m 25s

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