disable MLJ Registry tests in ci

Author: ablaom

.github/workflows/ci.yml

@@ -43,7 +43,7 @@ jobs:
       - uses: julia-actions/julia-runtest@v1
         env:
           # This environment variable enables the integration tests:
-          MLJ_TEST_REGISTRY: '1'
+          # MLJ_TEST_REGISTRY: '1'
       - uses: julia-actions/julia-processcoverage@v1
       - uses: codecov/codecov-action@v4
         with: