NIFIREG-441 - Add test data source factory for Postgres 12 & 13

[pvillard31]

Run tests with:

mvn verify -Dspring.profiles.active=postgres-12
mvn verify -Dspring.profiles.active=postgres-13

[bbende]

Tested this out locally and happened to be on a new laptop where I had never run these IT tests before and got a failure:
{"message":"No such image: quay.io/testcontainers/ryuk:0.2.3"}

I'm guessing maybe I always had this image cached before. Found this discussion which mentioned how testcontainers 1.15.1 would have a fix for something similar:
testcontainers/testcontainers-java#3574

Everything passed for me using that version, so can we update that in the root pom?

Also, any reason to not include postgres 12 and 13 in the test-all-dbs profile?

[pvillard31]

I just pushed a commit to update the dependency version for testcontainers. Thanks for the review @bbende !

[bbende]

Thanks, tests passing locally now, will merge