feat: release agent 12.20.0

[draios-jenkins]

bump agent image tags for agent and sysdig charts to 12.20.0

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update sysdig and agent charts for new agent release

update agent tag in agent chart

change detected: * key "$.image.tag" updated from "12.19.0" to "12.20.0", in file "charts/agent/values.yaml"

bump the chart version of the agent chart

change detected: * key "$.appVersion" updated from "12.19.0" to "12.20.0", in file "charts/agent/Chart.yaml" change detected: * key "$.version" updated from "1.19.3" to "1.19.4", in file "charts/agent/Chart.yaml"

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