Restore SCIP installation step w/o version pinning in setup-idaes Action

.github/actions/setup-idaes/action.yml

@@ -8,10 +8,10 @@ inputs:
     description: 'Command to use to install `install-target`'
     required: false
     default: pip --no-cache-dir install --progress-bar off
-  ampl-scip-version:
-    description: Version of AMPL Scip solver to install
+  ampl-scip-pip-target:
+    description: pip install target (dist name and optionally version constraint) of AMPL SCIP solver to install
     required: false
-    default: '20240121'
+    default: ampl-module-scip
 runs:
   using: "composite"
   steps:
@@ -46,9 +46,10 @@ runs:
         echo '::group::Output of "idaes get-extensions" command'
         idaes get-extensions --extra petsc --verbose
         echo '::endgroup::'
-    - name: Install SCIP from AMPL
+    - name: Install AMPL SCIP (${{ inputs.ampl-scip-pip-target }})
+      if: inputs.ampl-scip-pip-target
       shell: bash -l {0}
       run: |
         echo '::group::Output of "pip install ampl_module_scip" command'
-        ${{ inputs.install-command }} --index-url https://pypi.ampl.com ampl_module_scip==${{ inputs.ampl-scip-version }}
+        ${{ inputs.install-command }} --index-url https://pypi.ampl.com ${{ inputs.ampl-scip-pip-target }}
         echo '::endgroup::'