RPC Spec submodule commit needs to be updated to the latest commit

[renonick87]

Bug Report

The RPC Spec submodule is not pointing to the correct commit and is referencing a commit before the 7.1.0 release. If the library is rebuilt from this submodule then it will be missing RPC updates that were included in the 7.1.0 release.

Reproduction Steps

1. Checkout the sdl_javascript_suite repo.
2. Run git submodule init and git submodule update in a terminal window.

Expected Behavior

The RPC Spec submodule is pointing to the 7.1.0 release of the RPC Spec.

Observed Behavior

The RPC Spec submodule is not pointing to the 7.1.0 release of the RPC Spec.

[renonick87]

Closed by #464