Update mitre/heimdall-lite Docker tag to v2.6.37

This MR contains the following updates:

Package	Type	Update	Change
mitre/heimdall-lite	ironbank-docker	patch	2.6.35 -> 2.6.37
mitre/heimdall-lite		patch	2.6.35 -> 2.6.37
mitre/heimdall-lite	stage	patch	2.6.35 -> 2.6.37

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