Bump spark-core from 2.5 to 2.7.2 in /ktable-aggregate-query#2

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dependabot/maven/ktable-aggregate-query/com.sparkjava-spark-core-2.7.2LearningJournal/Kafka-Streams-Real-time-Stream-Processing:dependabot/maven/ktable-aggregate-query/com.sparkjava-spark-core-2.7.2Copy head branch name to clipboard