Use the last Plone 5.2 version pins

plone-5.2.x.cfg

@@ -1,18 +1,5 @@
 [buildout]
 extends =
     base.cfg
-    https://dist.plone.org/release/5.2.3/versions.cfg
+    https://dist.plone.org/release/5.2-latest/versions.cfg
 find-links += https://dist.plone.org/thirdparty/
-versions=versions
-
-[versions]
-black = 20.8b1
-
-# Error: The requirement ('virtualenv>=20.0.35') is not allowed by your [versions] constraint (20.0.26)
-virtualenv = 20.0.35
-
-# Error: The requirement ('pep517>=0.9') is not allowed by your [versions] constraint (0.8.2)
-pep517 = 0.9.1
-
-# Error: The requirement ('importlib-metadata>=1') is not allowed by your [versions] constraint (0.23)
-importlib-metadata = 2.0.0