Pin to newer pyrsistent.

<19.3 can have performance problems on 3.11 where there aren't
wheels (and where I think it's falling back to using the pure-
Python implementation even on CPython). Here it's ~2x slower.

Author: Julian

pyproject.toml

@@ -33,7 +33,7 @@ classifiers = [
 dynamic = ["version"]
 dependencies = [
   "attrs>=22.2.0",
-  "pyrsistent",
+  "pyrsistent>=0.19.3",
 ]
 
 [project.urls]