chore(deps): update dependency org.mockito:mockito-junit-jupiter to v3.12.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.mockito:mockito-junit-jupiter	3.12.2 -> 3.12.3

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Release Notes

mockito/mockito

v3.12.3

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3.12.3

• 2021-08-24 - 9 commit(s) by Rafael Winterhalter
• Fix implementation of proxy mock maker for toString and add additional unit tests. (#​2405)
• Avoid cache breakage (#​2402)
• Add a limited mock maker that is based only on the java.lang.reflect.Proxy utility (#​2397)

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