remove: 3.7 build workflow

end of line as of june 27 2023

.github/workflows/build.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python: ["3.7", "3.8", "3.9", "3.10", "3.11"]
+        python: ["3.8", "3.9", "3.10", "3.11"]
     name: Python ${{ matrix.python }}
     steps:
       - uses: actions/checkout@v2