*: 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/eventlog/secureboot.go b/metropolis/pkg/tpm/eventlog/secureboot.go
index 46e1f95..d2aa721 100644
--- a/metropolis/pkg/tpm/eventlog/secureboot.go
+++ b/metropolis/pkg/tpm/eventlog/secureboot.go
@@ -24,7 +24,7 @@
 
 	"github.com/google/certificate-transparency-go/x509"
 
-	"git.monogon.dev/source/nexantic.git/metropolis/pkg/tpm/eventlog/internal"
+	"source.monogon.dev/metropolis/pkg/tpm/eventlog/internal"
 )
 
 // SecurebootState describes the secure boot status of a machine, as determined