Replace old default values for ENV variables

[surchs]

We have some old / outdated default values for unset ENV variables:

api/app/api/utility.py

Lines 26 to 32 in a17eda8

	GRAPH_ADDRESS = EnvVar(
	"NB_GRAPH_ADDRESS", os.environ.get("NB_GRAPH_ADDRESS", "206.12.99.17")
	)
	GRAPH_DB = EnvVar(
	"NB_GRAPH_DB", os.environ.get("NB_GRAPH_DB", "test_data/query")
	)
	GRAPH_PORT = EnvVar("NB_GRAPH_PORT", os.environ.get("NB_GRAPH_PORT", 5820))

Specifically:

• NB_GRAPH_ADDRESS (should be localhost or something else) and
• NB_GRAPH_PORT (should be 7200 since GraphDB)

This probably hasn't caused any issues because we deploy via docker-compose where these values are actively set to their correct defaults:

https://github.com/neurobagel/recipes/blob/7b8669530569a5e69f03b740d53373cafec4d1e8/docker-compose.yml#L11-L19

But we should change them anyhow.