chore: bump dbt-core upper bound to <1.11.9 (#1400)

## Summary

- Bump `dbt-core` upper bound from `<1.11.7` to `<1.11.9` to include
1.11.7 and 1.11.8

All changes reviewed — no breaking changes to adapter interfaces or
dbt-databricks behavior.

## Test plan

- [x] CI passes

Author: sd-db

CHANGELOG.md

@@ -11,6 +11,10 @@
 - Fix column order mismatch in microbatch and replace_where incremental strategies by using INSERT BY NAME syntax ([#1338](https://github.com/databricks/dbt-databricks/issues/1338))
 - Fix `dbt run --empty` failing with inline `ref()` / `source()` aliases ([dbt-labs/dbt-adapters#660](https://github.com/dbt-labs/dbt-adapters/issues/660))
 
+### Under the Hood
+
+- Bump upper bound of dbt-core to `<1.11.9` to include dbt-core 1.11.8
+
 ## dbt-databricks 1.11.6 (Mar 10, 2026)
 
 ### Features

pyproject.toml

@@ -27,7 +27,7 @@ dependencies = [
     "databricks-sql-connector[pyarrow]>=4.1.1, <4.1.4",
     "dbt-adapters>=1.22.0, <1.23.0",
     "dbt-common>=1.37.0, <1.38.0",
-    "dbt-core>=1.11.2, <1.11.7",
+    "dbt-core>=1.11.2, <1.11.9",
     "dbt-spark>=1.10.0, <1.11.0",
     "keyring>=23.13.0, <25.6.0",
     "pydantic>=1.10.0, <2.13.0",