Remove pipx to fix python build error

.github/workflows/build.yml

@@ -29,7 +29,7 @@ jobs:
         uses: pre-commit/action@646c83fcd040023954eafda54b4db0192ce70507 # v3.0.0
       - name: Check Poetry lock file integrity
         run: |
-          pipx install --python python${{ env.python-version }} --pip-args=--constraint=.github/constraints.txt poetry
+          python${{ env.python-version }} -m pip install --constraint=.github/constraints.txt poetry
           poetry config virtualenvs.in-project true
           poetry check
 
@@ -68,7 +68,7 @@ jobs:
           sudo apt install -qq --no-install-recommends gir1.2-gtk-4.0 libgirepository1.0-dev
       - name: Install Poetry
         run: |
-          pipx install --python python${{ matrix.python-version }} --pip-args=--constraint=.github/constraints.txt poetry
+          python${{ matrix.python-version }} -m pip install --constraint=.github/constraints.txt poetry
           poetry config virtualenvs.in-project true
       - name: Collect Project Data
         id: meta