wendelin.core: v↑ 2.0.alpha3 -> 2.0.alpha3.post7

Since the wendelin.core 2.alpha3 release 9 month ago, new fixes
were added to wendelin.core, which we would like to have in SlapOS.
One very important new feature is that this wendelin.core version now
support golang 1.20, so with this we can easily proceed to upgrade our
default golang version.

/reviewed-by @kirr
/reviewed-on nexedi/slapos!1416

component/wendelin.core/buildout.cfg

@@ -50,7 +50,7 @@ CGO_LDFLAGS += -Wl,-rpath=${zlib:location}/lib
 recipe  = slapos.recipe.build:gitclone
 repository = https://lab.nexedi.com/nexedi/wendelin.core.git
 branch   = master
-revision = wendelin.core-2.0.alpha3-0-g6315384
+revision = wendelin.core-2.0.alpha3-7-g885b355
 # dir is pretty name as top-level recipe
 location = ${buildout:parts-directory}/wendelin.core
 git-executable = ${git:location}/bin/git