ci: remove additional python setup

Author: kpsherva

.github/workflows/tests.yml

@@ -31,7 +31,7 @@ jobs:
       fail-fast: false
       matrix:
           tests-chunk: [acquisition, circulation, document_requests, ill, ils]
-          python-version: [3.9]
+          python-version: [3.9, 3.12]
           requirements-level: [pypi]
           db-service: [postgresql14]
           search-service: [opensearch2]
@@ -50,13 +50,6 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
 
-      - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v5
-        with:
-          python-version: ${{ matrix.python-version }}
-          cache: pip
-          cache-dependency-path: setup.cfg
-
       - name: Install dependencies
         run: |
           pip install ".[$EXTRAS]"