⬆️(CI) bump python version in backend test

We were testing the backend with python 3.10.0, but
actually the backend was running with python 3.12.6.
We bump the python version in the backend test to match
the running version of the backend.

Author: AntoLC

.github/workflows/impress.yml

@@ -107,7 +107,9 @@ jobs:
       - name: Install Python
         uses: actions/setup-python@v3
         with:
-          python-version: "3.10"
+          python-version: "3.12.6"
+      - name: Upgrade pip and setuptools
+        run: pip install --upgrade pip setuptools
       - name: Install development dependencies
         run: pip install --user .[dev]
       - name: Check code formatting with ruff
@@ -199,7 +201,7 @@ jobs:
       - name: Install Python
         uses: actions/setup-python@v3
         with:
-          python-version: "3.10"
+          python-version: "3.12.6"
 
       - name: Install development dependencies
         run: pip install --user .[dev]