e update checkout action & config not using dashes

.github/workflows/geospade_ubuntu.yml

@@ -16,7 +16,7 @@ jobs:
         os: ["ubuntu-latest"]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           submodules: false # does not work with self-hosted testdata
       - name: Checkout Testdata

setup.cfg

@@ -7,9 +7,9 @@ name = geospade
 version = attr: geospade.__version__
 description = A place for classes and properties of raster and vector geometries and their geospatial operations alike.
 author = TU Wien MRS group
-author-email = [email protected]
+author_email = [email protected]
 license = mit
-long-description = file: README.md
+long_description = file: README.md
 long_description_content_type = text/markdown
 url = https://github.com/TUW-GEO/geospade
 keywords =