CI: clear caches before install

Author: oripress

.github/workflows/pr-checks.yml

@@ -52,9 +52,12 @@ jobs:
         run: |
           echo "Installing dependencies..."
           python -m pip install --upgrade pip uv -q
-          python -m pip install --only-binary=:all: psutil==5.9.8 -q
+          python -m pip cache purge || true
+          rm -rf ~/.cache/pip ~/.cache/uv ~/.cache/uv-build || true
+          uv cache clean || true
+          python -m pip install --only-binary=:all: psutil==5.9.8 -q --no-cache-dir
           uv pip compile pyproject.toml -o requirements.txt --universal --all-extras
-          python -m pip install -r requirements.txt -q
+          python -m pip install -r requirements.txt -q --no-cache-dir
           echo "Dependencies installed."
 
       # --- Ruff Formatting & Linting --- #