chore(deps): update docker.io/library/eclipse-mosquitto docker tag to v2.0.20

[red-hat-konflux[bot]]

This PR contains the following updates:

Package	Type	Update	Change
docker.io/library/eclipse-mosquitto	tekton-step-image	patch	2.0.18 -> 2.0.20

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[clyang82]

/retest

[clyang82]

/retest