Filter s3 rather than ABS

Author: joshmoore

.github/workflows/python-package.yml

@@ -75,9 +75,7 @@ jobs:
       run: |
         # Skip ABS on 3.9, see https://github.com/zarr-developers/zarr-python/pull/1542/#issuecomment-1945557365 etc.
         if [[ "${{ matrix.python-version }}" == '3.9' ]]; then
-            echo "ZARR_TEST_ABS=0" >> "$GITHUB_ENV"
-        else
-            echo "ZARR_TEST_ABS=1" >> "$GITHUB_ENV"
+            PYTEST_ADDOPTS="-k 'not test_s3'"
         fi
         conda activate zarr-env
         mkdir ~/blob_emulator

.github/workflows/windows-testing.yml

@@ -47,9 +47,7 @@ jobs:
         run: |
           # Skip ABS on 3.9, see https://github.com/zarr-developers/zarr-python/pull/1542/#issuecomment-1945557365 etc.
           if [[ "${{ matrix.python-version }}" == '3.9' ]]; then
-              echo "ZARR_TEST_ABS=0" >> "$GITHUB_ENV"
-          else
-              echo "ZARR_TEST_ABS=1" >> "$GITHUB_ENV"
+            PYTEST_ADDOPTS="-k 'not test_s3'"
           fi
           conda activate zarr-env
           mkdir ~/blob_emulator