Fix bpo-39416: Change "Numeric" to lower case; an english word, not a class name...

Fix bpo-39416: Change "Numeric" to lower case; an english word, not a class name (GH-22867)

This is a trivial fix to [bpo-39416](), which didn't come up until it was already committed

```
Change "Numeric" to "numeric".

I believe this is trivial enough to not need an issue or a NEWS entry, although
I'm unclear on what branches the original pull request received backports.
```

Automerge-Triggered-By: GH:merwok
(cherry picked from commit f8b1ccd63c94bcde1c15d56d24add89861b6ceee)

Co-authored-by: kpinc <kop@karlpinc.com>