*: git.monogon.dev -> source.monogon.dev

This implements T882, setting our (virtual) GOPATH to source.monogon.dev
for this repository.

Test Plan: Refactor, CI only.

X-Origin-Diff: phab/D686
GitOrigin-RevId: c5e2309089948ffc3a98e68e2e0e1cbb157d3a36
diff --git a/metropolis/pkg/logbuffer/linebuffer.go b/metropolis/pkg/logbuffer/linebuffer.go
index 246a91b..8048604 100644
--- a/metropolis/pkg/logbuffer/linebuffer.go
+++ b/metropolis/pkg/logbuffer/linebuffer.go
@@ -22,7 +22,7 @@
 	"strings"
 	"sync"
 
-	apb "git.monogon.dev/source/nexantic.git/metropolis/proto/api"
+	apb "source.monogon.dev/metropolis/proto/api"
 )
 
 // Line is a line stored in the log buffer - a string, that has been perhaps truncated (due to exceeded limits).