Fix rules_foreign_cc 0.15.1 incompatibility by downgrading bazel_features to 1.21.0

Author: Copilot

bazel/repositories.bzl

@@ -22,9 +22,9 @@ def proxy_wasm_cpp_host_repositories():
     maybe(
         http_archive,
         name = "bazel_features",
-        sha256 = "07271d0f6b12633777b69020c4cb1eb67b1939c0cf84bb3944dc85cc250c0c01",
-        strip_prefix = "bazel_features-1.38.0",
-        urls = ["https://github.com/bazel-contrib/bazel_features/releases/download/v1.38.0/bazel_features-v1.38.0.tar.gz"],
+        sha256 = "af3d4fb1cf4f25942cb4a933b1ad93a0ea9fe9ee70c2af7f369fb72a67c266e5",
+        strip_prefix = "bazel_features-1.21.0",
+        urls = ["https://github.com/bazel-contrib/bazel_features/releases/download/v1.21.0/bazel_features-v1.21.0.tar.gz"],
     )
 
     # Update platforms for crate_universe. Can remove when we update Bazel version.