[Enum] add news entry for enum module reversion (GH-27099)

diff --git a/Misc/NEWS.d/next/Library/2021-07-12-10-43-31.bpo-44559.YunVKY.rst b/Misc/NEWS.d/next/Library/2021-07-12-10-43-31.bpo-44559.YunVKY.rst
new file mode 100644
index 0000000..0259a92
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2021-07-12-10-43-31.bpo-44559.YunVKY.rst
@@ -0,0 +1 @@
+[Enum] module reverted to 3.9; 3.10 changes pushed until 3.11