formula: add global caching for declared_runtime_dependencies
#16008
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This improves
brew audit --except=installed --tap=homebrew/core
times from ~45s (with #16007 applied) to ~30s.This optimisation is not enabled for formulae with options as I'm not 100% confident caching would behave correctly here. Though that doesn't matter for Homebrew/core, and third-party taps typically are much smaller scale that
brew audit
is already quick.