*: 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/tpm/tpm.go b/metropolis/pkg/tpm/tpm.go
index 29bd208..e650ff9 100644
--- a/metropolis/pkg/tpm/tpm.go
+++ b/metropolis/pkg/tpm/tpm.go
@@ -40,8 +40,8 @@
 	"github.com/pkg/errors"
 	"golang.org/x/sys/unix"
 
-	"git.monogon.dev/source/nexantic.git/metropolis/pkg/logtree"
-	"git.monogon.dev/source/nexantic.git/metropolis/pkg/sysfs"
+	"source.monogon.dev/metropolis/pkg/logtree"
+	"source.monogon.dev/metropolis/pkg/sysfs"
 )
 
 var (