Remove pinning from ibis-framework

Author: pearu

.github/workflows/rbc_test.yml

@@ -295,7 +295,7 @@ jobs:
         - name: Install additional packages
           shell: bash -l {0}
           run: |
-            mamba install -c conda-forge omniscidb nbval ibis-omniscidb matplotlib pandas ibis-framework=2.0
+            mamba install -c conda-forge omniscidb nbval ibis-omniscidb matplotlib pandas ibis-framework
 
         - name: Start omniscidb server
           shell: bash -l {0}