chore(deps): update codecov/codecov-action action to v4

Author: renovate[bot]

.github/workflows/build.yml

@@ -26,4 +26,4 @@ jobs:
                     PYTEST_ADDOPTS: "--strict --cov --cov-report=term-missing --cov-report=xml"
                 run: tox
             -   name: codecov
-                uses: codecov/codecov-action@v3
+                uses: codecov/codecov-action@v4

.github/workflows/release.yml

@@ -27,7 +27,7 @@ jobs:
                     PYTEST_ADDOPTS: "--strict --cov --cov-report=term-missing --cov-report=xml"
                 run: tox
             -   name: codecov
-                uses: codecov/codecov-action@v3
+                uses: codecov/codecov-action@v4
     deploy:
         runs-on: ubuntu-latest
         steps: