Remove root_package from npm_translate_lock. (#8921)

This attribute is removed in the next major version of `aspect_rules_js`. It's
not actually needed here [according to](aspect-build/rules_js#2709 (comment))
a maintainer of `aspect_rules_js`.

Author: sbarfurth

MODULE.bazel

@@ -63,9 +63,6 @@ npm.npm_translate_lock(
     name = "flatbuffers_npm",
     npmrc = "//:.npmrc",
     pnpm_lock = "//ts:pnpm-lock.yaml",
-    # Override the Bazel package where pnpm-lock.yaml is located and link
-    # to the specified package instead.
-    root_package = "ts",
     verify_node_modules_ignored = "//:.bazelignore",
 )
 use_repo(npm, "flatbuffers_npm")