chore(deps): bump mockito from 5.19.0 to 5.20.0 in /hiero-dependency-versions (#2533)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

hiero-dependency-versions/build.gradle.kts

@@ -5,7 +5,7 @@ val bouncycastle = "1.80"
 val grpc = "1.75.0"
 val protobuf = "4.31.1"
 val slf4j = "2.0.17"
-val mockito = "5.19.0"
+val mockito = "5.20.0"
 
 dependencies {
     api(platform("org.springframework.boot:spring-boot-dependencies:3.5.6"))