Move minimum DSI version to 0.4.2

We're backporting a feature "conversion metrics" to 1.7. Conversion
metrics don't exist in DSI < 0.4.2 which is problematic if we allow
for those versions. This ensures that those who are on a version of
1.7 that supports conversion metrics will also have the requisit version
of DSI.

core/setup.py

@@ -74,7 +74,7 @@
         "dbt-extractor~=0.5.0",
         "minimal-snowplow-tracker~=0.0.2",
         # DSI is under active development, so we're pinning to specific dev versions for now.
-        "dbt-semantic-interfaces~=0.4.0",
+        "dbt-semantic-interfaces~=0.4.2",
         # ----
         # Expect compatibility with all new versions of these packages, so lower bounds only.
         "jsonschema>=3.0",