build: fix ci fails because of codecov-action@v3 (updated to v4) + dr…

…op py3.7

See codecov/codecov-action#598 (comment)

Signed-off-by: Stephen L. <LRQ3000@gmail.com>

.github/workflows/ci-build.yml

@@ -19,7 +19,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.7", "3.10", "*", "3.12-dev", pypy-3.9]  # check the list of versions: https://github.com/actions/python-versions/releases and https://github.com/actions/setup-python/blob/main/docs/advanced-usage.md -- note that "*" represents the latest stable version of Python
+        python-version: ["3.8", "3.10", "*", "3.12-dev", pypy-3.9]  # check the list of versions: https://github.com/actions/python-versions/releases and https://github.com/actions/setup-python/blob/main/docs/advanced-usage.md -- note that "*" represents the latest stable version of Python
         os: [ ubuntu-latest, windows-latest, macos-latest ] # jobs that run on Windows and macOS runners that GitHub hosts consume minutes at 2 and 10 times the rate that jobs on Linux runners consume respectively. But it's free for public OSS repositories.
     steps:
     - uses: actions/checkout@v3
@@ -54,7 +54,7 @@ jobs:
         coverage run --branch -m pytest . -v
         coverage report -m
     - name: Upload coverage to Codecov
-      uses: codecov/codecov-action@v3
+      uses: codecov/codecov-action@v4
       with:
         token: ${{ secrets.CODECOV_TOKEN }}  # not required for public repos, but still advised to avoid rate-limiting API by GitHub which makes the upload fails randomly: https://community.codecov.com/t/upload-issues-unable-to-locate-build-via-github-actions-api/3954/9 and https://github.com/codecov/codecov-action/issues/598
         #directory: ./coverage/reports/