Update bitnami/elasticsearch-exporter Docker tag to v1.9.0

This MR contains the following updates:

Package	Type	Update	Change
bitnami/elasticsearch-exporter		minor	1.8.0 -> 1.9.0
bitnami/elasticsearch-exporter	ironbank-docker	minor	1.8.0 -> 1.9.0
bitnami/elasticsearch-exporter	stage	minor	1.8.0 -> 1.9.0

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