use right pep-440 standard version number

lstein · lstein · commit 210998081ad5 · 2023-02-24T15:14:39.000-05:00
diff --git a/ldm/invoke/_version.py b/ldm/invoke/_version.py
@@ -1 +1 @@
-__version__='2.3.1-p1'
+__version__='2.3.1.post1'
