Update ref from a deprecated branch to main branch

Author: boulch

base-6.1.cfg

@@ -9,7 +9,7 @@ extends =
     https://dist.plone.org/release/6.1.3/versions.cfg
     https://dist.plone.org/release/6.1.3/versions-ecosystem.cfg
     https://dist.plone.org/release/6.1.3/versions-extra.cfg
-    https://raw.githubusercontent.com/IMIO/buildout.smartweb/plone613/versions.cfg
+    https://raw.githubusercontent.com/IMIO/buildout.smartweb/refs/heads/main/versions.cfg
     https://raw.githubusercontent.com/IMIO/buildout.smartweb/main/sources.cfg
 
 parts =