*: 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/kubernetes/clusternet/BUILD.bazel b/metropolis/node/kubernetes/clusternet/BUILD.bazel
index 49ad828..b2f0687 100644
--- a/metropolis/node/kubernetes/clusternet/BUILD.bazel
+++ b/metropolis/node/kubernetes/clusternet/BUILD.bazel
@@ -6,7 +6,7 @@
         "clusternet.go",
         "netlink_compat.go",
     ],
-    importpath = "git.monogon.dev/source/nexantic.git/metropolis/node/kubernetes/clusternet",
+    importpath = "source.monogon.dev/metropolis/node/kubernetes/clusternet",
     visibility = ["//metropolis/node/kubernetes:__subpackages__"],
     deps = [
         "//metropolis/node:go_default_library",