neotest: Don't pin wendelin.core

What was "latest" in 2018 is outdated by now.
-> Just use the versions that is provided by component/wendelin.core that neotest extends from.

software/neotest/software.cfg

@@ -119,10 +119,6 @@ eggs    =
     ${wendelin.core:egg}
 
 
-# wendelin.core: latest not yet released
-[wendelin.core-repository]
-revision= v0.11-15-gf785ac079b
-
 # ping eggs versions
 [versions]
 ZODB3 = 3.11.0