Utilities/Release: Update macOS signing script for CPack OSXX11 removal

Since  commit 4ef974e6 (CPack: Remove undocumented deprecated OSXX11
generator, 2021-11-05), the `CPack.OSXScriptLauncher.in` binary is no
longer installed in the `CMake.app` bundle, so it does not need to be
23 jobs for !6784 with rel-macos-sign-notarize in 3 minutes and 33 seconds (queued for 1 second)
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