Dataproc - July 27th, 2021 [Change, Fix]

## Change New [sub-minor versions](https://cloud.google.com/dataproc/docs/concepts/versioning/dataproc-versions) of Dataproc images: 1.3.94-debian10, 1.3.94-ubuntu18, 1.4.65-debian10, 1.4.65-ubuntu18, 1.5.40-centos8, 1.5.40-debian10, 1.5.40-ubuntu18, 2.0.14-centos8, 2.0.14-debian10, and 2.0.14-ubuntu18. ## Change The following component versions were updated in [**image 2.0**](https://cloud.google.com/dataproc/docs/concepts/versioning/dataproc-release-2.0): * Upgraded Scala version to [2.12.14](https://www.scala-lang.org/news/2.12.14). * Upgrades Spark version to [3.1.2](http://spark.apache.org/releases/spark-release-3-1-2.html). * Upgraded Zeppelin version to [0.9.1-SNAPSHOT](https://github.com/apache/zeppelin/commit/64a36216e044d9ce79df253527c7913d08ab81e7). ## Fix Fixed a rare bug that sometimes happened when scaling down the number of secondary workers in a cluster in which the update operation would fail with error 'Resource is not a member of' or 'Cannot delete instance that was already deleted'.