Update tensorflow/serving Docker tag to v2.12.2

This MR contains the following updates:

Package	Type	Update	Change
tensorflow/serving	ironbank-docker	patch	2.12.1 -> 2.12.2
tensorflow/serving		patch	2.12.1 -> 2.12.2
tensorflow/serving	stage	patch	2.12.1 -> 2.12.2

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