Remove invocation of bootstrap script, no longer needed. Fixes #3100.

Author: jaraco

.github/workflows/ci-sage.yml

@@ -75,7 +75,7 @@ jobs:
           python3 -m pip install build
       - name: Run make dist, prepare upstream artifact
         run: |
-          (cd build/pkgs/${{ env.SPKG }}/src && python3 -m bootstrap && python3 -m build --sdist) \
+          (cd build/pkgs/${{ env.SPKG }}/src && python3 -m build --sdist) \
           && mkdir -p upstream && cp build/pkgs/${{ env.SPKG }}/src/dist/*.tar.gz upstream/${{ env.SPKG }}-git.tar.gz \
           && echo "sage-package create ${{ env.SPKG }} --version git --tarball ${{ env.SPKG }}-git.tar.gz --type=standard" > upstream/update-pkgs.sh \
           && if [ -n "${{ env.REMOVE_PATCHES }}" ]; then echo "(cd ../build/pkgs/${{ env.SPKG }}/patches && rm -f ${{ env.REMOVE_PATCHES }}; :)" >> upstream/update-pkgs.sh; fi \