Swift: do not use codeql_pkg_files needlessly

Author: redsun82

swift/downgrades/BUILD.bazel

@@ -1,6 +1,6 @@
-load("//misc/bazel:pkg.bzl", "codeql_pkg_files", "strip_prefix")
+load("@rules_pkg//pkg:mappings.bzl", "pkg_files", "strip_prefix")
 
-codeql_pkg_files(
+pkg_files(
     name = "downgrades",
     srcs = glob(
         ["**"],