build: update to bazel 3.6

Bumps the version of Bazel to 3.6 like in angular/angular in an attempt to resolve some of the recent CI flakes.

Author: crisbeto

.bazelversion

@@ -1 +1 @@
-3.1.0
+3.6.0

WORKSPACE

@@ -97,9 +97,9 @@ sass_repositories()
 # Bring in bazel_toolchains for RBE setup configuration.
 http_archive(
     name = "bazel_toolchains",
-    sha256 = "144290c4166bd67e76a54f96cd504ed86416ca3ca82030282760f0823c10be48",
-    strip_prefix = "bazel-toolchains-3.1.1",
-    url = "https://github.com/bazelbuild/bazel-toolchains/archive/3.1.1.tar.gz",
+    sha256 = "4fb3ceea08101ec41208e3df9e56ec72b69f3d11c56629d6477c0ff88d711cf7",
+    strip_prefix = "bazel-toolchains-3.6.0",
+    url = "https://github.com/bazelbuild/bazel-toolchains/archive/3.6.0.tar.gz",
 )
 
 load("@bazel_toolchains//repositories:repositories.bzl", bazel_toolchains_repositories = "repositories")
@@ -115,7 +115,7 @@ rbe_autoconfig(
     # need to pull the image and run it in order determine the toolchain configuration.
     # See: https://github.com/bazelbuild/bazel-toolchains/blob/master/configs/ubuntu16_04_clang/versions.bzl#L9
     base_container_digest = "sha256:b516a2d69537cb40a7c6a7d92d0008abb29fba8725243772bdaf2c83f1be2272",
-    digest = "sha256:0b8fa87db4b8e5366717a7164342a029d1348d2feea7ecc4b18c780bc2507059",
+    digest = "sha256:4fb3ceea08101ec41208e3df9e56ec72b69f3d11c56629d6477c0ff88d711cf7",
     registry = "marketplace.gcr.io",
     # We can't use the default "ubuntu16_04" RBE image provided by the autoconfig because we need
     # a specific Linux kernel that comes with "libx11" in order to run headless browser tests.