Bump codecov/codecov-action from 5 to 6

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 5 to 6.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Commits](codecov/codecov-action@v5...v6)

⚠️  This version introduces support for node24 which make cause breaking changes
   for systems that do not currently support node24.

Author: DimitriPapadopoulos

.github/workflows/ci.yaml

@@ -63,7 +63,7 @@ jobs:
         shell: "bash -l {0}"
         run: pytest -v
 
-      - uses: codecov/codecov-action@v5
+      - uses: codecov/codecov-action@v6
         with:
           fail_ci_if_error: true
           token: ${{ secrets.CODECOV_TOKEN }}
@@ -117,7 +117,7 @@ jobs:
       - name: Run checksum tests
         run: pytest -v tests/test_checksum32.py
 
-      - uses: codecov/codecov-action@v5
+      - uses: codecov/codecov-action@v6
         with:
           fail_ci_if_error: true
           token: ${{ secrets.CODECOV_TOKEN }}
@@ -166,7 +166,7 @@ jobs:
       - name: Run Zarr integration tests
         run: pytest tests/test_zarr3.py tests/test_zarr3_import.py
 
-      - uses: codecov/codecov-action@v5
+      - uses: codecov/codecov-action@v6
         with:
           fail_ci_if_error: true
           token: ${{ secrets.CODECOV_TOKEN }}