Fix quarkus-jackson build warning in hibernate-reactive-panache IT module

[famod]

Fixes:

[WARNING] 
[WARNING] Some problems were encountered while building the effective model for io.quarkus:quarkus-integration-test-hibernate-reactive-panache:jar:999-SNAPSHOT
[WARNING] 'dependencies.dependency.(groupId:artifactId:type:classifier)' must be unique: io.quarkus:quarkus-jackson:jar -> duplicate declaration of version (?) @ line 79, column 21
[WARNING] 
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING] 
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
[WARNING] 

I guess this is a side effect of this commit: 8645fa0#diff-6ed62e3af0f07f41ecd42d6042c65810e3675eb6e49282966b951b188ea11eae (/cc @Postremus)

Seems quarkus-jackson is not required at all (anymore) in that module? Tests are passing locally without it.

/cc @FroMage @Sanne

[gsmet]

Thanks!