Master: Update fluent/fluent-bit Docker tag to v1.7.9

This MR contains the following updates:

Package	Type	Update	Change
fluent/fluent-bit	ironbank-docker	patch	1.7.8 -> 1.7.9
fluent/fluent-bit		patch	1.7.8 -> 1.7.9
fluent/fluent-bit	stage	patch	1.7.8 -> 1.7.9

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