Move `_value2member_map_` changelog back to 2.12.11 (#1874)
Move `_value2member_map_` changelog back to 2.12.11 (#1874)

Partially reverts 4acf5785c54f4ccb8f41402991f6ddc5d8b28b89.
This had been included in 2.12.11 all along.

PyCQA/astroid