Specify antlr4-python3-runtime package version in isolation test work…

…flow (babelfish-for-postgresql#116)

Previously, the Isolation test workflow was failing because it was
implicitly  installing the latest version 4.10 of the antlr4-python3-runtime
package, which was not compatible with antlr 4.9.3.

This commits fixes this by specifying the version in the isolation
test workflow configuration.

Signed-off-by: Harsh Lunagariya <lunharsh@amazon.com>

Co-authored-by: Harsh Lunagariya <lunharsh@amazon.com>

.github/workflows/isolation-tests.yml

@@ -49,7 +49,7 @@ jobs:
           curl https://packages.microsoft.com/config/ubuntu/20.04/prod.list | sudo tee /etc/apt/sources.list.d/mssql-release.list
           cd ~/work/babelfish_extensions/babelfish_extensions/test/python
           sudo ACCEPT_EULA=Y apt-get install -y msodbcsql17 python3-dev
-          pip3 install pyodbc pymssql pytest pytest-xdist antlr4-python3-runtime
+          pip3 install pyodbc pymssql pytest pytest-xdist antlr4-python3-runtime==4.9.3
       
       - name: Generate .spec file parser
         run: |