Remove databricks-sql-connector from pyproject.toml (#2131)

We included the `databricks-sql-connector` dependency due to the reasons
stated in the GitHub issue
databricks/databricks-sql-python#190. Now that
this issue has been fixed, we should remove this dependency.

python-sdk/pyproject.toml

@@ -92,8 +92,6 @@ openlineage = [
 databricks = [
     "databricks-cli",
     "apache-airflow-providers-databricks",
-    # TODO: Remove this once https://github.com/databricks/databricks-sql-python/pull/191 released
-    "databricks-sql-connector<2.9.0",
 ]
 
 mssql = [
@@ -121,8 +119,6 @@ all = [
     "sqlalchemy-bigquery>=1.3.0",
     "databricks-cli",
     "apache-airflow-providers-databricks",
-    # TODO: Remove this once https://github.com/databricks/databricks-sql-python/pull/191 released
-    "databricks-sql-connector<2.9.0",
     "s3fs",
     "protobuf",
     "apache-airflow-providers-openlineage>=1.4.0",