temporary skip test_slice_irregular_datetime_index_with_nan

to be reverted after pandas-dev/pandas#37473 backported

Author: simonjayhawkins

config.sh

@@ -32,5 +32,5 @@ function run_tests {
     python -c 'import pandas; pandas.show_versions()'
     # Skip test_maybe_promote_int_with_int: https://github.com/pandas-dev/pandas/issues/31856
     # TestPandasContainer for 3.7.0 failure
-    python -c 'import sys; import pandas; pandas.test(extra_args=["-m not clipboard", "--skip-slow", "--skip-network", "--skip-db", "-n=2", "-k not test_maybe_promote_int_with_int and not test_file_descriptor_leak"]) if sys.version_info[:2] != (3, 7) else None'
+    python -c 'import sys; import pandas; pandas.test(extra_args=["-m not clipboard", "--skip-slow", "--skip-network", "--skip-db", "-n=2", "-k not test_maybe_promote_int_with_int and not test_file_descriptor_leak and not test_slice_irregular_datetime_index_with_nan"]) if sys.version_info[:2] != (3, 7) else None'
 }