fix build error of version 2.4.10 with pinning uglify-js #825
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required version pinning of uglify-js to 3.17.4 as dependency of grunt-contrib-uglify to avoid / work around a critical build error (JS_Parse_Error [SyntaxError]: Calling delete on expression not allowed in strict mode) on the shipped js/vendor/forge.0.6.9.min.js file
fixes #823