Postgres R2DBC artifact now includes native image metadata

[johanandren]

We can probably drop our custom meta and depend on the shipped ones:

[error] Deduplicate found different file contents in the following:
[error]   Jar name = akka-persistence-r2dbc_2.13-1.2.4.jar, jar org = com.lightbend.akka, entry target = META-INF/native-image/org.postgresql/r2dbc-postgresql/reflect-config.json
[error]   Jar name = r2dbc-postgresql-1.0.5.RELEASE.jar, jar org = org.postgresql, entry target = META-INF/native-image/org.postgresql/r2dbc-postgresql/reflect-config.json