*: 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/switchroot.go b/metropolis/node/core/switchroot.go
index d897ec7..7391e75 100644
--- a/metropolis/node/core/switchroot.go
+++ b/metropolis/node/core/switchroot.go
@@ -27,7 +27,7 @@
 
 	"golang.org/x/sys/unix"
 
-	"git.monogon.dev/source/nexantic.git/metropolis/pkg/logtree"
+	"source.monogon.dev/metropolis/pkg/logtree"
 )
 
 // switchRoot moves the root from initramfs into a tmpfs