*: 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/test/launch/cli/launch-multi2/main.go b/metropolis/test/launch/cli/launch-multi2/main.go
index 553e4ae..a2e00bc 100644
--- a/metropolis/test/launch/cli/launch-multi2/main.go
+++ b/metropolis/test/launch/cli/launch-multi2/main.go
@@ -29,10 +29,10 @@
 	grpcretry "github.com/grpc-ecosystem/go-grpc-middleware/retry"
 	"google.golang.org/grpc"
 
-	common "git.monogon.dev/source/nexantic.git/metropolis/node"
-	"git.monogon.dev/source/nexantic.git/metropolis/pkg/logbuffer"
-	apb "git.monogon.dev/source/nexantic.git/metropolis/proto/api"
-	"git.monogon.dev/source/nexantic.git/metropolis/test/launch"
+	common "source.monogon.dev/metropolis/node"
+	"source.monogon.dev/metropolis/pkg/logbuffer"
+	apb "source.monogon.dev/metropolis/proto/api"
+	"source.monogon.dev/metropolis/test/launch"
 )
 
 // prefixedStdout is a os.Stdout proxy that prefixes every line with a constant