software/repman: use default golang version

no need to stick to an old EOL version

component/replication-manager/buildout.cfg

@@ -6,7 +6,6 @@ parts =
   gowork
 
 [gowork]
-golang  = ${golang1.13:location}
 install =
 buildflags =  -v --tags server --ldflags "-extldflags 'static' -w -s -X main.GoOS=linux -X main.GoArch=amd64 -X main.Version=2.1 -X main.FullVersion=$FULLVERSION -X main.Build=$(date +%FT%T%z) -X main.WithProvisioning=ON -X main.WithOpenSVC=OFF -X main.WithHaproxy=ON -X main.WithMaxscale=ON  -X main.WithMariadbshardproxy=ON -X  main.WithProxysql=ON -X  main.WithSphinx=ON -X main.WithArbitration=OFF -X main.WithArbitrationClient=ON -X main.WithMonitoring=ON -X main.WithHttp=ON -X main.WithBackup=ON -X main.WithMail=ON -X main.WithEnforce=ON -X main.WithDeprecate=ON"
 

component/restic/buildout.cfg

@@ -5,9 +5,6 @@ extends =
 parts =
   restic
 
-[gowork]
-golang  = ${golang1.13:location}
-
 
 [restic]
 recipe  = plone.recipe.command