Bump codecov/codecov-action from 6 to 7 (#52)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/CI.yml

@@ -35,7 +35,7 @@ jobs:
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-runtest@v1
       - uses: julia-actions/julia-processcoverage@v1
-      - uses: codecov/codecov-action@v6
+      - uses: codecov/codecov-action@v7
         with:
           files: lcov.info
   docs: