Revert "Update to newer workflow setup"

This reverts commit c6a87ef.

.github/workflows/test-coverage.yaml

@@ -38,33 +38,5 @@ jobs:
       - uses: r-lib/actions/setup-renv@v2
 
       - name: Test coverage
-        run: |
-          cov <- covr::package_coverage(
-            quiet = FALSE,
-            clean = FALSE,
-            install_path = file.path(normalizePath(Sys.getenv("RUNNER_TEMP"), winslash = "/"), "package")
-          )
-          covr::to_cobertura(cov)
+        run: covr::codecov()
         shell: Rscript {0}
-
-      - uses: codecov/codecov-action@v4
-        with:
-          fail_ci_if_error: ${{ github.event_name != 'pull_request' && true || false }}
-          file: ./cobertura.xml
-          plugin: noop
-          disable_search: true
-          token: ${{ secrets.CODECOV_TOKEN }}
-
-      - name: Show testthat output
-        if: always()
-        run: |
-          ## --------------------------------------------------------------------
-          find '${{ runner.temp }}/package' -name 'testthat.Rout*' -exec cat '{}' \; || true
-        shell: bash
-
-      - name: Upload test results
-        if: failure()
-        uses: actions/upload-artifact@v4
-        with:
-          name: coverage-test-failures
-          path: ${{ runner.temp }}/package