*: 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/node/core/cluster/manager.go b/metropolis/node/core/cluster/manager.go
index 4cb7ea9..1df9bac 100644
--- a/metropolis/node/core/cluster/manager.go
+++ b/metropolis/node/core/cluster/manager.go
@@ -31,13 +31,13 @@
 	"github.com/golang/protobuf/proto"
 	"go.etcd.io/etcd/clientv3"
 
-	common "git.monogon.dev/source/nexantic.git/metropolis/node"
-	"git.monogon.dev/source/nexantic.git/metropolis/node/core/consensus"
-	"git.monogon.dev/source/nexantic.git/metropolis/node/core/localstorage"
-	"git.monogon.dev/source/nexantic.git/metropolis/node/core/localstorage/declarative"
-	"git.monogon.dev/source/nexantic.git/metropolis/node/core/network"
-	"git.monogon.dev/source/nexantic.git/metropolis/pkg/supervisor"
-	apb "git.monogon.dev/source/nexantic.git/metropolis/proto/api"
+	common "source.monogon.dev/metropolis/node"
+	"source.monogon.dev/metropolis/node/core/consensus"
+	"source.monogon.dev/metropolis/node/core/localstorage"
+	"source.monogon.dev/metropolis/node/core/localstorage/declarative"
+	"source.monogon.dev/metropolis/node/core/network"
+	"source.monogon.dev/metropolis/pkg/supervisor"
+	apb "source.monogon.dev/metropolis/proto/api"
 )
 
 // Manager is a finite state machine that joins this node (ie., Metropolis node running on a virtual/physical machine)