fixed dbt-tests-adapter version installed for dbt-oracle 1.8

Author: aosingh

.github/workflows/oracle-xe-adapter-tests.yml

@@ -48,7 +48,7 @@ jobs:
       - name: Install dbt-oracle with core dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install pytest 'dbt-tests-adapter~=1.7,<1.8'
+          pip install pytest 'dbt-tests-adapter~=1.8,<1.9'
           pip install -r requirements.txt
           pip install -e .