tests: remove requirements-builder

* creates problems on python3.12 and it exists an alternative.

.github/workflows/tests.yml

@@ -29,8 +29,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-          python-version: [3.8, 3.9, "3.10", "3.11"]
-          requirements-level: [pypi]
+          python-version: ["3.9", "3.10", "3.11", "3.12"]
     env:
       EXTRAS: tests
     steps:
@@ -41,21 +40,11 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
-
-      - name: Generate dependencies
-        run: |
-          pip install wheel requirements-builder
-          requirements-builder -e "$EXTRAS" --level=${{ matrix.requirements-level }} setup.py > .${{ matrix.requirements-level }}-${{ matrix.python-version }}-requirements.txt
-
-      - name: Cache pip
-        uses: actions/cache@v4
-        with:
-          path: ~/.cache/pip
-          key: ${{ runner.os }}-pip-${{ hashFiles('.${{ matrix.requirements-level }}-${{ matrix.python-version }}-requirements.txt') }}
+          cache: pip
+          cache-dependency-path: setup.cfg
 
       - name: Install dependencies
         run: |
-          pip install -r .${{matrix.requirements-level}}-${{ matrix.python-version }}-requirements.txt
           pip install .[$EXTRAS]
           pip freeze
           docker --version