fix: attempt to pin setuptools to get builds working

.github/workflows/ci.yml

@@ -51,9 +51,15 @@ jobs:
         with:
           poetry-version: ${{ env.POETRY_VERSION }}
 
+      - name: Patch Poetry's internal virtualenv setuptools
+        run: $HOME/.local/share/pypoetry/venv/bin/python -m pip install "setuptools<71.0.0"
+
       - name: Install dependencies
         run: poetry install --no-root
 
+      - name: Patch project virtualenv setuptools
+        run: $(poetry env info --path)/bin/python -m pip install "setuptools<71.0.0"
+
       - name: Run tox
         run: poetry run tox -e flake8
 
@@ -85,9 +91,15 @@ jobs:
         with:
           poetry-version: ${{ env.POETRY_VERSION }}
 
+      - name: Patch Poetry's internal virtualenv setuptools
+        run: $HOME/.local/share/pypoetry/venv/bin/python -m pip install "setuptools<71.0.0"
+
       - name: Install dependencies
         run: poetry install --no-root
 
+      - name: Patch project virtualenv setuptools
+        run: $(poetry env info --path)/bin/python -m pip install "setuptools<71.0.0"
+
       - name: Run tox
         run: poetry run tox -e mypy-${{ matrix.toxenv-factor }}
 
@@ -125,6 +137,13 @@ jobs:
       - name: Create reports directory
         run: mkdir ${{ env.REPORTS_DIR }}
 
+      - name: Install gettext (macOS)
+        if: runner.os == 'macOS'
+        run: |
+          brew install gettext
+          sudo mkdir -p /usr/local/opt
+          sudo ln -sfn $(brew --prefix gettext) /usr/local/opt/gettext
+
       - name: Set up Python
         uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
         with:
@@ -136,9 +155,22 @@ jobs:
         with:
           poetry-version: ${{ env.POETRY_VERSION }}
 
+      - name: Patch Poetry's internal virtualenv setuptools (Unix)
+        if: runner.os != 'Windows'
+        run: $HOME/.local/share/pypoetry/venv/bin/python -m pip install "setuptools<71.0.0"
+
+      - name: Patch Poetry's internal virtualenv setuptools (Windows)
+        if: runner.os == 'Windows'
+        shell: pwsh
+        run: |
+          & "$env:APPDATA\pypoetry\venv\Scripts\python.exe" -m pip install "setuptools<71.0.0"
+
       - name: Install dependencies
         run: poetry install --no-root
 
+      - name: Patch project virtualenv setuptools
+        run: poetry run python -m pip install "setuptools<71.0.0"
+
       - name: Ensure build successful
         run: poetry build
 

.github/workflows/deploy.yml

@@ -55,6 +55,9 @@ jobs:
         with:
           poetry-version: ${{ env.POETRY_VERSION }}
 
+      - name: Patch Poetry's internal virtualenv setuptools
+        run: $(poetry env info --path)/bin/pip install "setuptools<71.0.0"
+
       - name: Install dependencies
         run: poetry install --no-root