Bump PyIceberg in CI to 0.6.1 (#879)

Author: Fokko

dev/Dockerfile

@@ -39,7 +39,7 @@ WORKDIR ${SPARK_HOME}
 ENV SPARK_VERSION=3.5.0
 ENV ICEBERG_SPARK_RUNTIME_VERSION=3.5_2.12
 ENV ICEBERG_VERSION=1.5.0
-ENV PYICEBERG_VERSION=0.6.0
+ENV PYICEBERG_VERSION=0.6.1
 
 RUN curl --retry 3 -s -C - https://archive.apache.org/dist/spark/spark-${SPARK_VERSION}/spark-${SPARK_VERSION}-bin-hadoop3.tgz -o spark-${SPARK_VERSION}-bin-hadoop3.tgz \
  && tar xzf spark-${SPARK_VERSION}-bin-hadoop3.tgz --directory /opt/spark --strip-components 1 \

mkdocs/docs/how-to-release.md

@@ -218,3 +218,7 @@ A committer triggers the [`Python Docs` Github Actions](https://github.com/apach
 ## Update the Github template
 
 Make sure to create a PR to update the [GitHub issues template](https://github.com/apache/iceberg-python/blob/main/.github/ISSUE_TEMPLATE/iceberg_bug_report.yml) with the latest version.
+
+## Update the integration tests
+
+Ensure to update the `PYICEBERG_VERSION` in the [Dockerfile](https://github.com/apache/iceberg-python/blob/main/dev/Dockerfile).