fix: Bump CI Spark version to 3.5.7 (#1832)

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The integration tests are failing CI because Spark 3.5.6 is not
available. We should use 3.5.7 now.

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Existing CI tests.

Author: mbutrovich

crates/integration_tests/testdata/spark/Dockerfile

@@ -27,7 +27,7 @@ ENV PYTHONPATH=$SPARK_HOME/python:$SPARK_HOME/python/lib/py4j-0.10.9.7-src.zip:$
 RUN mkdir -p ${HADOOP_HOME} && mkdir -p ${SPARK_HOME} && mkdir -p /home/iceberg/spark-events
 WORKDIR ${SPARK_HOME}
 
-ENV SPARK_VERSION=3.5.6
+ENV SPARK_VERSION=3.5.7
 ENV ICEBERG_SPARK_RUNTIME_VERSION=3.5_2.12
 ENV ICEBERG_VERSION=1.10.0