build(deps): bump apache-airflow from 2.6.1 to 2.7.3 in /docker/datahub-ingestion-base #67

Job	Run time
build (./gradlew build -x :metadata-ingestion:build -x :metadata-ingestion:check -x docs-website:...	10m 48s
event-file	4s
build (./gradlew build -x :metadata-ingestion:build -x :metadata-ingestion:check -x docs-website:...	18m 14s
quickstart-compose-validation	21s
build (./gradlew :datahub-frontend:build :datahub-web-react:build --parallel, UTC)	13m 1s
build (./gradlew :datahub-frontend:build :datahub-web-react:build --parallel, America/New_York)	13m 7s
build (./gradlew :metadata-ingestion-modules:airflow-plugin:build --parallel, UTC)	5m 50s
build (./gradlew :metadata-ingestion-modules:airflow-plugin:build --parallel, America/New_York)	6m 11s
	1h 7m 36s

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