add github workflow for test-pypi cross-OS wheel builds

Author: AlePalu

.github/workflows/testpypi-linux.yml

@@ -34,7 +34,7 @@ jobs:
         run: |
           mkdir -p deps
           mkdir -p deps/eigen3
-          curl -L https://gitlab.com/libeigen/eigen/-/archive/3.4.0/eigen-3.4.0.tar.gz \
+          curl -L https://gitlab.com/libeigen/eigen/-/archive/5.0.0/eigen-5.0.0.tar.gz \
             | tar xz -C deps/eigen3 --strip-components=1
 
       - name: Build wheels

.github/workflows/testpypi-macos.yml

@@ -27,7 +27,7 @@ jobs:
         run: |
           mkdir -p deps
           mkdir -p deps/eigen3
-          curl -L https://gitlab.com/libeigen/eigen/-/archive/3.4.0/eigen-3.4.0.tar.gz \
+          curl -L https://gitlab.com/libeigen/eigen/-/archive/5.0.0/eigen-5.0.0.tar.gz \
             | tar xz -C deps/eigen3 --strip-components=1
 
       - name: Build wheels