Update falcosecurity/falco-exporter Docker tag to v0.8.6

This MR contains the following updates:

Package	Type	Update	Change
falcosecurity/falco-exporter	ironbank-docker	patch	0.8.5 -> 0.8.6
falcosecurity/falco-exporter	stage	patch	0.8.5 -> 0.8.6

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