Add explicit version of insight-influxdb-metrics

Without it, Maven assumend they're of transitive version
${project.version} which translated to version of fuse, not fabric8.

I had following error without this fix

```
[ERROR] Failed to execute goal on project jboss-a-mq: Could not resolve dependencies for project org.jboss.amq:jboss-a-mq:jar:6.2.0.redhat-SNAPSHOT: Could not find artifact io.fabric8.insight:insight-influxdb-metrics:jar:6.2.0.redhat-SNAPSHOT in fusesource.m2-snapshot (https://repository.jboss.org/nexus/content/groups/fs-public-snapshots/) -> [Help 1]

```