add dbt/jsonschemas to recursive-include (#12126)

Author: MichelleArk

.changes/unreleased/Under the Hood-20251028-163413.yaml

@@ -0,0 +1,6 @@
+kind: Under the Hood
+body: add dbt/jsonschemas to manifest.in
+time: 2025-10-28T16:34:13.943289-04:00
+custom:
+    Author: michelleark
+    Issue: "12126"

core/MANIFEST.in

@@ -1,3 +1,4 @@
-recursive-include dbt/include *.py *.sql *.yml *.html *.md .gitkeep .gitignore *.json
+recursive-include dbt/include *.py *.sql *.yml *.html *.md .gitkeep .gitignore
 include dbt/py.typed
 recursive-include dbt/task/docs *.html
+recursive-include dbt/jsonschemas *.json