Bump acorn from 5.7.3 to 5.7.4 in /ghc-8.11.0.20200222-src/utils/haddock/haddock-api/resources/html#2

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dependabot/npm_and_yarn/ghc-8.11.0.20200222-src/utils/haddock/haddock-api/resources/html/acorn-5.7.4grin-compiler/ghc-8.11.0.20200222-src-git-fromSTG-Quickest:dependabot/npm_and_yarn/ghc-8.11.0.20200222-src/utils/haddock/haddock-api/resources/html/acorn-5.7.4Copy head branch name to clipboard