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/metropolis/pkg/verity/BUILD.bazel b/metropolis/pkg/verity/BUILD.bazel
index b500b31..7e0e465 100644
--- a/metropolis/pkg/verity/BUILD.bazel
+++ b/metropolis/pkg/verity/BUILD.bazel
@@ -2,24 +2,24 @@
 load("//metropolis/test/ktest:ktest.bzl", "ktest")
 
 go_library(
-    name = "go_default_library",
+    name = "verity",
     srcs = ["encoder.go"],
     importpath = "source.monogon.dev/metropolis/pkg/verity",
     visibility = ["//visibility:public"],
 )
 
 go_test(
-    name = "go_default_test",
+    name = "verity_test",
     srcs = ["encoder_test.go"],
-    embed = [":go_default_library"],
+    embed = [":verity"],
     deps = [
-        "//metropolis/pkg/devicemapper:go_default_library",
-        "@com_github_stretchr_testify//require:go_default_library",
-        "@org_golang_x_sys//unix:go_default_library",
+        "//metropolis/pkg/devicemapper",
+        "@com_github_stretchr_testify//require",
+        "@org_golang_x_sys//unix",
     ],
 )
 
 ktest(
     cmdline = "ramdisk_size=16384",
-    tester = ":go_default_test",
+    tester = ":verity_test",
 )