Upgrade to bazel 0.28.1.

We disable "bazel fetch" because it seems to do more than what is needed for build and test. Hence I'd rather only do the build.

We also update bazel-gazelle, as per  https://github.com/bazelbuild/bazel-gazelle#running-gazelle-with-bazel -- I'm not quite sure this is needed with disabling "bazel fetch", but it's a newer version so we should update anyhow.

PiperOrigin-RevId: 275047119

WORKSPACE

@@ -274,17 +274,19 @@ http_file(
 http_archive(
     name = "io_bazel_rules_go",
     urls = [
-        "https://storage.googleapis.com/bazel-mirror/github.com/bazelbuild/rules_go/releases/download/0.18.6/rules_go-0.18.6.tar.gz",
-        "https://github.com/bazelbuild/rules_go/releases/download/0.18.6/rules_go-0.18.6.tar.gz",
+        "https://storage.googleapis.com/bazel-mirror/github.com/bazelbuild/rules_go/releases/download/v0.20.0/rules_go-v0.20.0.tar.gz",
+        "https://github.com/bazelbuild/rules_go/releases/download/v0.20.0/rules_go-v0.20.0.tar.gz",
     ],
-    sha256 = "f04d2373bcaf8aa09bccb08a98a57e721306c8f6043a2a0ee610fd6853dcde3d",
+    sha256 = "078f2a9569fa9ed846e60805fb5fb167d6f6c4ece48e6d409bf5fb2154eaf0d8",
 )
 
 http_archive(
     name = "bazel_gazelle",
-    strip_prefix = "bazel-gazelle-395b3a1c2f22d8cd63e19c92d4e1556eb3d96dde",
-    urls = ["https://github.com/bazelbuild/bazel-gazelle/archive/395b3a1c2f22d8cd63e19c92d4e1556eb3d96dde.zip"],
-    sha256 = "a40deb9c0cfa2e424ad9b15fe68aa3d259ccb0ef6405dd4fe0506d86d75b8475",
+    urls = [
+        "https://storage.googleapis.com/bazel-mirror/github.com/bazelbuild/bazel-gazelle/releases/download/v0.19.0/bazel-gazelle-v0.19.0.tar.gz",
+        "https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.19.0/bazel-gazelle-v0.19.0.tar.gz",
+    ],
+    sha256 = "41bff2a0b32b02f20c227d234aa25ef3783998e5453f7eade929704dcff7cd4b",
 )
 
 load("@io_bazel_rules_go//go:deps.bzl", "go_rules_dependencies", "go_register_toolchains")
@@ -318,6 +320,12 @@ go_repository(
     importpath = "golang.org/x/oauth2",
 )
 
+go_repository(
+    name = "org_golang_x_net",
+    commit = "74dc4d7220e7acc4e100824340f3e66577424772",
+    importpath = "golang.org/x/net",
+)
+
 go_repository(
     name = "com_google_cloud_go",
     commit = "777200caa7fb8936aed0f12b1fd79af64cc83ec9",

kokoro/run_tests.sh

@@ -29,7 +29,7 @@ if [[ -n "${KOKORO_ROOT}" ]]; then
   rm -f ~/.bazelrc
 
   # TODO(b/131821833) Use the latest version of Bazel.
-  use_bazel.sh 0.26.1
+  use_bazel.sh 0.28.1
 
   if [[ "${PLATFORM}" == 'darwin' ]]; then
     export DEVELOPER_DIR="/Applications/Xcode_${XCODE_VERSION}.app/Contents/Developer"
@@ -84,8 +84,6 @@ echo "using go: $(which go)"
 go version
 
 run_linux_tests() {
-  time bazel fetch ...
-
   # Build all targets, except objc.
   time bazel build "${DISABLE_SANDBOX_ARGS[@]}" \
   -- //... \
@@ -107,8 +105,6 @@ run_macos_tests() {
   : "${IOS_SDK_VERSION:=12.2}"
   : "${XCODE_VERSION:=10.2}"
 
-  time bazel fetch ...
-
   # Build all the iOS targets.
   time bazel build "${DISABLE_SANDBOX_ARGS[@]}" \
   --compilation_mode=dbg \