[Bazel] Fixes 071b3c2 (#220376)

This fixes 071b3c2 (#220352).

Buildkite error link:
https://buildkite.com/llvm-project/upstream-bazel/builds?commit=071b3c2fe08770c7d1875c1d58b6e1f9fe74506f

Co-authored-by: Google Bazel Bot <google-bazel-bot@google.com>

Author: forking-google-bazel-bot[bot]

utils/bazel/llvm-project-overlay/libc/BUILD.bazel

@@ -900,6 +900,7 @@ libc_support_library(
     name = "types_char8_t",
     hdrs = ["hdr/types/char8_t.h"],
     deps = [
+        ":hdr_uchar_overlay",
         ":llvm_libc_types_char8_t",
     ],
 )