tests: set up bazel_features deps in WORKSPACE (dep of rules_foreign_cc)

`rules_foreign_cc` added `bazel_features` as a dep in 0.12.0:
bazel-contrib/rules_foreign_cc@979172f#diff-74def84f93f97fa7a426540f5a6bbe124dd7d4dc0732f6cc014fa68f525b1f30R14

Author: rrbutani

tests/WORKSPACE

@@ -229,6 +229,11 @@ load("@rules_foreign_cc//foreign_cc:repositories.bzl", "rules_foreign_cc_depende
 
 rules_foreign_cc_dependencies()
 
+load("@bazel_features//:deps.bzl", "bazel_features_deps")
+
+# Dep of `rules_foreign_cc`.
+bazel_features_deps()
+
 _ALL_CONTENT = """\
 filegroup(
     name = "all_srcs",