fix(docgen): add missing deps (#305)

Found when using a raw starlark_doc_extract rule

Author: alexeagle

swc/private/BUILD.bazel

@@ -12,6 +12,8 @@ bzl_library(
     srcs = ["swc.bzl"],
     visibility = ["//swc:__subpackages__"],
     deps = [
+        "//swc:providers",
+        "@aspect_bazel_lib//lib:copy_file",
         "@aspect_bazel_lib//lib:platform_utils",
         "@aspect_rules_js//js:libs",
         "@aspect_rules_js//js:providers",