feat(CI): add PIP constraint file.

Author: yvantor

.github/workflows/build.yml

@@ -26,11 +26,11 @@ jobs:
         name: Install Python
         uses: actions/setup-python@v5
         with:
-          python-version: 3.10
+          python-version: 3.9
           cache: pip
       -
         name: Install Python requirements
-        run: pip install -r requirements.txt
+        run: PIP_CONSTRAINT=constraints.txt pip install -r requirements.txt
       -
         name: Install RISC-V GCC toolchain
         uses: pulp-platform/pulp-actions/riscv-gcc-install@v2.4.1

constraints.txt

@@ -0,0 +1 @@
+setuptools<82

requirements.txt

@@ -8,4 +8,4 @@ mkdocs
 mkdocs-material
 markdown-grid-tables
 tclint==0.4.2
-flatdict==4.1.0
+flatdict