Changed CI to use marcus_development branch of RMS

Temporary - please revert after RMG-RMS interface
overhaul is merged

Author: ssun30

.github/workflows/CI.yml

@@ -97,7 +97,7 @@ jobs:
         timeout-minutes: 120 # this usually takes 20-45 minutes (or hangs for 6+ hours).
         run: |
           python -c "import julia; julia.install(); import diffeqpy; diffeqpy.install()"
-          julia -e 'using Pkg; Pkg.add(PackageSpec(name="ReactionMechanismSimulator",rev="main")); using ReactionMechanismSimulator'
+          julia -e 'using Pkg; Pkg.add(PackageSpec(name="ReactionMechanismSimulator",rev="marcus_development")); using ReactionMechanismSimulator'
 
       - name: Install Q2DTor
         run: echo "" | make q2dtor