m/pkg/jsonpatch: remove duplicate file ending

The duplicate .go ending appears to be unintentional.

Change-Id: I25d0800e29212da27186ea8636f6eddb113b5814
Reviewed-on: https://review.monogon.dev/c/monogon/+/2936
Tested-by: Jenkins CI
Reviewed-by: Lorenz Brun <lorenz@monogon.tech>
Vouch-Run-CI: Lorenz Brun <lorenz@monogon.tech>
diff --git a/metropolis/pkg/jsonpatch/BUILD.bazel b/metropolis/pkg/jsonpatch/BUILD.bazel
index 3aa6d95..e6dd37e 100644
--- a/metropolis/pkg/jsonpatch/BUILD.bazel
+++ b/metropolis/pkg/jsonpatch/BUILD.bazel
@@ -2,7 +2,7 @@
 
 go_library(
     name = "jsonpatch",
-    srcs = ["jsonpatch.go.go"],
+    srcs = ["jsonpatch.go"],
     importpath = "source.monogon.dev/metropolis/pkg/jsonpatch",
     visibility = ["//metropolis:__subpackages__"],
 )