update minimum supported python version to 3.8

.github/workflows/publish.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@d27e3f3d7c64b4bbf8e4abfb9b63b83e846e0435 # v4.5.0
         with:
-          python-version: '3.7'
+          python-version: '3.8'
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip

.github/workflows/tests.yml

@@ -69,7 +69,7 @@ jobs:
       matrix:
         os: [ubuntu-20.04, windows-2019, macos-11]
         # across all operating systems
-        python-version: ["3.7", "3.11"]
+        python-version: ["3.8", "3.11"]
         include:
           # on Ubuntu run these as well
           - os: ubuntu-20.04
@@ -104,7 +104,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.7", "3.11"]
+        python-version: ["3.8", "3.11"]
     steps:
     - name: Checkout capa with submodules
       # do only run if BN_SERIAL is available, have to do this in every step, see https://github.com/orgs/community/discussions/26726#discussioncomment-3253118