golang: Switch default to Go1.18

Go1.18 is the next stable go release. There is already Go1.19
(released 2022-08-02), but we incrementally increase versions.
For Go1.18 there are already many bug fix releases (last one
2022-12-06) which gives it a more stable/mature impression.

/reviewed-on nexedi/slapos!1305

component/golang/buildout.cfg

@@ -152,7 +152,7 @@ bin	= ${gowork.dir:bin}
 depends = ${gowork.goinstall:recipe}
 
 # go version used for the workspace (possible to override in applications)
-golang  = ${golang1.17:location}
+golang  = ${golang1.18:location}
 
 # no special build flags by default
 buildflags =

software/grafana/software.cfg

@@ -50,6 +50,8 @@ revision      = v1.17.3-0-g24a552b90b
 
 
 [gowork]
+# Fails with current default golang1.18
+golang = ${golang1.17:location}
 install =
   ${go_github.com_grafana_loki:location}:./cmd/loki
   ${go_github.com_grafana_loki:location}:./cmd/promtail