Bump jszip, @microsoft/sp-build-web and @microsoft/sp-webpart-workbench in /sp2019#26

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mastertom-daly/spfx-global-navigation:masterfrom

dependabot/npm_and_yarn/sp2019/jszip-and-microsoft/sp-build-web-and-microsoft/sp-webpart-workbench-3.7.1tom-daly/spfx-global-navigation:dependabot/npm_and_yarn/sp2019/jszip-and-microsoft/sp-build-web-and-microsoft/sp-webpart-workbench-3.7.1Copy head branch name to clipboard