treewide: switch to gomod and bump everything

This switches version resolution from fietsje to gomod and updates
all Go dependencies. It also bumps rules_go (required by gVisor) and
switches the Gazelle naming convention from go_default_xxx to the
standard Bazel convention of the default target having the package
name.

Since Kubernetes dropped upstream Bazel support and doesn't check in
all generated files I manually pregenerated the OpenAPI spec. This
should be fixed, but because of the already-huge scope of this CL
and the rebase complexity this is not in here.

Change-Id: Iec8ea613d06946882426c2f9fad5bda7e8aaf833
Reviewed-on: https://review.monogon.dev/c/monogon/+/639
Reviewed-by: Sergiusz Bazanski <serge@monogon.tech>
Reviewed-by: Leopold Schabel <leo@nexantic.com>
diff --git a/third_party/go/patches/etcd-fix-stub.patch b/third_party/go/patches/etcd-fix-stub.patch
new file mode 100644
index 0000000..bb47ac4
--- /dev/null
+++ b/third_party/go/patches/etcd-fix-stub.patch
@@ -0,0 +1,9 @@
+--- a/grpc_testing/stub_server.go
++++ b/grpc_testing/stub_server.go
+@@ -86,5 +86,5 @@ func (d dummyStubServer) UnaryCall(context.Context, *testpb.SimpleRequest) (*tes
+ // NewDummyStubServer creates a simple test server that serves Unary calls with
+ // responses with the given payload.
+ func NewDummyStubServer(body []byte) *StubServer {
+-	return New(dummyStubServer{body: body})
++	return New(&dummyStubServer{body: body})
+ }