stack/slapos.cfg: version up zc.buildout 2.7.1+slapos020 and rubygemsrecipe 0.4.4

See:
nexedi/rubygemsrecipe!10
nexedi/slapos.buildout!29

component/slapos/build.sh

@@ -43,7 +43,7 @@ eggs =
 
 [versions]
 setuptools = 44.1.1
-zc.buildout = 2.7.1+slapos019
+zc.buildout = 2.7.1+slapos020
 zc.recipe.egg = 2.0.3+slapos003
 EOF
 

stack/slapos.cfg

@@ -137,7 +137,7 @@ eggs =
 [versions]
 setuptools = 44.1.1
 # Use SlapOS patched zc.buildout
-zc.buildout = 2.7.1+slapos019
+zc.buildout = 2.7.1+slapos020
 # Use SlapOS patched zc.recipe.egg (zc.recipe.egg 2.x is for Buildout 2)
 zc.recipe.egg = 2.0.3+slapos003
 
@@ -296,7 +296,7 @@ random2 = 1.0.1
 regex = 2020.9.27
 requests = 2.31.0
 rpdb = 0.1.5
-rubygemsrecipe  = 0.4.3
+rubygemsrecipe  = 0.4.4
 scandir = 1.10.0
 scikit-learn = 0.20.4
 seaborn = 0.7.1