Excavator: Upgrade dependencies (#232)

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Changes produced by the versions-props/upgrade-all check.

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versions.props

@@ -17,7 +17,7 @@ org.assertj:* = 3.11.1
 org.glassfish.jersey.core:jersey-common = 2.25.1
 org.hamcrest:hamcrest-core = 2.1
 org.immutables:value = 2.7.5
-org.mockito:mockito-core = 2.24.0
+org.mockito:mockito-core = 2.24.5
 org.slf4j:* = 1.7.25
 
 # conflict resolution