Remove codecov

This has been adding noise to the failures and at this point the
zoneinfo project is stable enough that it's probably not worth it.

In the future if we want to add coverage back in, we can do this:
https://hynek.me/articles/ditch-codecov-python/

.github/workflows/python-tests.yml

@@ -21,7 +21,6 @@ jobs:
     env:
       TOXENV: py
       TEST_EXTRAS_TOX: ${{ matrix.tzdata_extras }}
-      CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
 
     steps:
     - uses: actions/checkout@v3
@@ -35,9 +34,6 @@ jobs:
     - name: Run tests
       run: |
         python -m tox
-    - name: Report coverage
-      run: |
-        tox -e coverage-report,codecov
 
   c_coverage:
     runs-on: ${{ matrix.os }}
@@ -61,7 +57,7 @@ jobs:
           python -m pip install --upgrade pip 'tox>=3.18'
       - name: Run tests
         run: |
-          tox -e gcov,codecov
+          tox -e gcov
 
   build:
     runs-on: "ubuntu-latest"

tox.ini

@@ -61,15 +61,6 @@ commands =
     coverage report
     coverage xml
 
-[testenv:codecov]
-description = [only run on CI]: upload coverage data to codecov (depends on coverage running first)
-deps = codecov==2.1.1
-depends = coverage-report
-passenv = CODECOV_TOKEN
-skip_install = True
-commands =
-    python scripts/upload_codecov.py {toxworkdir}/.coverage
-
 [testenv:format]
 description = Run auto formatters
 skip_install = True