*: 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/build/fietsje/BUILD.bazel b/build/fietsje/BUILD.bazel
index 6e59787..77f1bbd 100644
--- a/build/fietsje/BUILD.bazel
+++ b/build/fietsje/BUILD.bazel
@@ -14,7 +14,7 @@
         "shelf.go",
         "transitive.go",
     ],
-    importpath = "git.monogon.dev/source/nexantic.git/build/fietsje",
+    importpath = "source.monogon.dev/build/fietsje",
     visibility = ["//visibility:private"],
     deps = [
         "//build/fietsje/proto:go_default_library",
diff --git a/build/fietsje/proto/BUILD.bazel b/build/fietsje/proto/BUILD.bazel
index 816164b..833f8e4 100644
--- a/build/fietsje/proto/BUILD.bazel
+++ b/build/fietsje/proto/BUILD.bazel
@@ -10,7 +10,7 @@
 
 go_proto_library(
     name = "proto_go_proto",
-    importpath = "git.monogon.dev/source/nexantic.git/build/fietsje/proto",
+    importpath = "source.monogon.dev/build/fietsje/proto",
     proto = ":proto_proto",
     visibility = ["//visibility:public"],
 )
@@ -18,6 +18,6 @@
 go_library(
     name = "go_default_library",
     embed = [":proto_go_proto"],
-    importpath = "git.monogon.dev/source/nexantic.git/build/fietsje/proto",
+    importpath = "source.monogon.dev/build/fietsje/proto",
     visibility = ["//visibility:public"],
 )
diff --git a/build/fietsje/proto/shelf.proto b/build/fietsje/proto/shelf.proto
index 394e5f0..52573a7 100644
--- a/build/fietsje/proto/shelf.proto
+++ b/build/fietsje/proto/shelf.proto
@@ -16,7 +16,7 @@
 
 syntax = "proto3";
 package nexantic.build.fietsje;
-option go_package = "git.monogon.dev/source/nexantic.git/build/fietsje/proto";
+option go_package = "source.monogon.dev/build/fietsje/proto";
 
 // The Shelf is a cache/lockfile of Fietsje dependencies. See //build/fietsje/shelf.go for more information.
 // This proto definition is used to generate text proto files. As such, repeated fields have singular names.
diff --git a/build/fietsje/shelf.go b/build/fietsje/shelf.go
index d3a1a1a..ea709be 100644
--- a/build/fietsje/shelf.go
+++ b/build/fietsje/shelf.go
@@ -26,7 +26,7 @@
 
 	"github.com/golang/protobuf/proto"
 
-	pb "git.monogon.dev/source/nexantic.git/build/fietsje/proto"
+	pb "source.monogon.dev/build/fietsje/proto"
 )
 
 // The Shelf is a combined cache and dependency lockfile, not unlike go.sum. It's implemented as a text proto file on