Switch Bazel's CI config to test on Java 11 platforms only.

This removes our Ubuntu 16.04 and Java 8 support.

RELNOTES: Bazel no longer supports Java 8. From this version on, the minimum required JDK is OpenJDK 11.
PiperOrigin-RevId: 404811395
diff --git a/.bazelrc b/.bazelrc
index 3b7d5d4..0fb596e 100644
--- a/.bazelrc
+++ b/.bazelrc
@@ -24,18 +24,8 @@
 build:ubuntu1804_java11 --platforms=//:rbe_ubuntu1804_java11_platform
 build:ubuntu1804_java11 --config=remote_shared
 
-# Configuration to build and test Bazel on RBE on Ubuntu 16.04 with Java 8
-build:ubuntu1604_java8 --extra_toolchains=@rbe_ubuntu1604_java8//java:all
-build:ubuntu1604_java8 --crosstool_top=@rbe_ubuntu1604_java8//cc:toolchain
-build:ubuntu1604_java8 --extra_toolchains=@rbe_ubuntu1604_java8//config:cc-toolchain
-build:ubuntu1604_java8 --extra_execution_platforms=//:rbe_ubuntu1604_java8_platform
-build:ubuntu1604_java8 --extra_execution_platforms=//:rbe_ubuntu1604_java8_highcpu_platform
-build:ubuntu1604_java8 --host_platform=//:rbe_ubuntu1604_java8_platform
-build:ubuntu1604_java8 --platforms=//:rbe_ubuntu1604_java8_platform
-build:ubuntu1604_java8 --config=remote_shared
-
 # Alias
-build:remote --config=ubuntu1604_java8
+build:remote --config=ubuntu1804_java11
 
 build:macos --macos_minimum_os=10.10