Bump the zlib version used for keras build (for security update).

PiperOrigin-RevId: 441544925

WORKSPACE

@@ -36,19 +36,15 @@ http_archive(
     urls = ["https://github.com/protocolbuffers/protobuf/archive/v3.9.2.tar.gz"],
 )
 
-# ZLIB
-# Need by com_google_protobuf. Note that the original URL from zlib side is not
-# available for now. We need to use bazel mirror as a backup.
+# ZLIB. Need by com_google_protobuf.
 http_archive(
     name = "zlib",
     build_file = "@com_google_protobuf//:third_party/zlib.BUILD",
-    sha256 = "c3e5e9fdd5004dcb542feda5ee4f0ff0744628baf8ed2dd5d66f8ca1197cb1a1",
-    strip_prefix = "zlib-1.2.11",
-    urls = [
-        "https://mirror.bazel.build/zlib.net/zlib-1.2.11.tar.gz",
-        "https://zlib.net/zlib-1.2.11.tar.gz",
-    ],
+    sha256 = "91844808532e5ce316b3c010929493c0244f3d37593afd6de04f71821d5136d9",
+    strip_prefix = "zlib-1.2.12",
+    urls = ["https://zlib.net/zlib-1.2.12.tar.gz"],
 )
 
+
 load("@com_google_protobuf//:protobuf_deps.bzl", "protobuf_deps")
 protobuf_deps()