software/grafana: update loki to v2.4.1

This contain the fix for go 1.16 that we backported, so we can use
upstream repository again

software/grafana/software.cfg

@@ -39,8 +39,8 @@ revision      = v7.5.2-0-gca413c612f
 [go_github.com_grafana_loki]
 <= go-git-package
 go.importpath = github.com/grafana/loki
-repository    = https://github.com/perrinjerome/loki
-revision      = v2.2.1-1-gda6d45f2
+repository    = https://github.com/grafana/loki
+revision      = v2.4.1-0-gf61a4d261
 
 [go_github.com_influxdata_influxdb]
 <= go-git-package
@@ -63,7 +63,7 @@ revision      = v0.0.1-0-gf8981f3
 [gowork]
 install =
   ${go_github.com_grafana_loki:location}:./cmd/loki
-  ${go_github.com_grafana_loki:location}:./cmd/promtail
+  ${go_github.com_grafana_loki:location}:./clients/cmd/promtail
   ${go_github.com_grafana_loki:location}:./cmd/logcli
   ${go_github.com_influxdata_telegraf:location}:./cmd/...
   ${go_github.com_influxdata_influxdb:location}:./cmd/...