Update dependency grunt-contrib-uglify to v2.3.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
grunt-contrib-uglify	devDependencies	minor	2.2.0 -> 2.3.0

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Release Notes

gruntjs/grunt-contrib-uglify

v2.3.0

Compare Source

v2.2.1

Compare Source

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