Update findsim.yml

setting up to install moose-core from git to get the latest version

.github/workflows/findsim.yml

@@ -41,7 +41,7 @@ jobs:
       # Runs a set of commands using the runners shell
       - name: Build
         run: |
-          python -m pip install pymoose --pre --upgrade
+          python -m pip install git+https://github.com/BhallaLab/moose-core.git
           python -m pip install jsonschema
       - name: Test scripts
         run: ./test.sh