Upgrade vanilla JDK to 11.

Note that this does NOT yet update the embbedded JDKs, this will be one
of the next steps after we actually build it on buildkite.

Part of bazelbuild#6592.

RELNOTES: None

WORKSPACE

@@ -129,9 +129,9 @@ http_file(
 
 http_file(
     name = "openjdk_linux_vanilla",
-    sha256 = "45f2dfbee93b91b1468cf81d843fc6d9a47fef1f831c0b7ceff4f1eb6e6851c8",
+    sha256 = "232b1c3511f0d26e92582b7c3cc363be7ac633e371854ca2f2e9f2b50eb72a75",
     urls = [
-        "https://mirror.bazel.build/openjdk/azul-zulu-9.0.7.1-jdk9.0.7/zulu9.0.7.1-jdk9.0.7-linux_x64.tar.gz",
+        "https://mirror.bazel.build/openjdk/azul-zulu11.2.3-jdk11.0.1/zulu11.2.3-jdk11.0.1-linux_x64.tar.gz",
     ],
     downloaded_file_path="zulu-linux-vanilla.tar.gz",
 )
@@ -168,9 +168,9 @@ http_file(
 
 http_file(
     name = "openjdk_macos_vanilla",
-    sha256 = "5a5b3225b86d3fdb51e9add5335f43cc19c6b2d9b8b5558e72b52d7b2ce9162e",
+    sha256 = "1edf366ee821e5db8e348152fcb337b28dfd6bf0f97943c270dcc6747cedb6cb",
     urls = [
-        "https://mirror.bazel.build/openjdk/azul-zulu-9.0.7.1-jdk9.0.7/zulu9.0.7.1-jdk9.0.7-macosx_x64.tar.gz",
+        "https://mirror.bazel.build/openjdk/azul-zulu11.2.3-jdk11.0.1/zulu11.2.3-jdk11.0.1-macosx_x64.tar.gz",
     ],
     downloaded_file_path="zulu-macos-vanilla.tar.gz",
 )
@@ -195,9 +195,9 @@ http_file(
 
 http_file(
     name = "openjdk_win_vanilla",
-    sha256 = "75f76c53c6a1f12b1a571b86bd9708ab75adf582d689dddc94fdd77dcc0f3f5c",
+    sha256 = "8e1e2b8347de6746f3fd1538840dd643201533ab113abc4ed93678e342d28aa3",
     urls = [
-        "https://mirror.bazel.build/openjdk/azul-zulu-9.0.7.1-jdk9.0.7/zulu9.0.7.1-jdk9.0.7-win_x64.zip",
+        "https://mirror.bazel.build/openjdk/azul-zulu11.2.3-jdk11.0.1/zulu11.2.3-jdk11.0.1-win_x64.zip",
     ],
     downloaded_file_path="zulu-win-vanilla.zip",
 )