Bump log4j-core from 2.9.0 to 2.15.0 in /recommender/OfflineRecommender#12

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dependabot/maven/recommender/OfflineRecommender/org.apache.logging.log4j-log4j-core-2.15.0ABigdataer/MovieRecommendSystem:dependabot/maven/recommender/OfflineRecommender/org.apache.logging.log4j-log4j-core-2.15.0Copy head branch name to clipboard