[bazel] Update WORKSPACE file in examples (#97613)

Author: Kirill

utils/bazel/examples/submodule/WORKSPACE

@@ -8,6 +8,8 @@ workspace(name = "submodule_example")
 
 SKYLIB_VERSION = "1.0.3"
 
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
 http_archive(
     name = "bazel_skylib",
     sha256 = "97e70364e9249702246c0e9444bccdc4b847bed1eb03c5a3ece4f83dfe6abc44",
@@ -28,6 +30,8 @@ load("@llvm-raw//utils/bazel:configure.bzl", "llvm_configure")
 
 llvm_configure(name = "llvm-project")
 
+load("@bazel_tools//tools/build_defs/repo:utils.bzl", "maybe")
+
 maybe(
     http_archive,
     name = "llvm_zlib",