Update jaegertracing/jaeger-agent Docker tag to v1.61.0

This MR contains the following updates:

Package	Type	Update	Change
jaegertracing/jaeger-agent		minor	1.60.0 -> 1.61.0
jaegertracing/jaeger-agent	ironbank-docker	minor	1.60.0 -> 1.61.0
jaegertracing/jaeger-agent	stage	minor	1.60.0 -> 1.61.0

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