Update setup.py to not use dbt-core pre-release (#963)

Author: colin-rogers-dbt

setup.py

@@ -55,7 +55,7 @@ def _plugin_version() -> str:
         # Pin to the patch or minor version, and bump in each new minor version of dbt-redshift.
         "redshift-connector>=2.1.3,<2.2",
         # add dbt-core to ensure backwards compatibility of installation, this is not a functional dependency
-        "dbt-core>=1.8.0b3",
+        "dbt-core>=1.8.0",
         # installed via dbt-core but referenced directly; don't pin to avoid version conflicts with dbt-core
         "sqlparse>=0.5.0,<0.6.0",
         "agate",