Update dependency uglify-js to v3.13.6

Created by: renovate[bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
uglify-js	3.13.5 -> 3.13.6

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Release Notes

mishoo/UglifyJS

v3.13.6

Compare Source

Features

• support optional chaining operator (f0de9a8, ce3c35f)
• improve granularity of variable substitutions (16411dc, 6ab26ee, fb03561, 4114431, 203f4b7, 3094eaa, d464be3)
• extend circular self-reference eliminations (53b57ee, 19d232b)

Bug Fixes

• __proto__ accessor (d833e66, 8e4a19f, df980db, 8bbfaac, ac1f7d6)
• default parameter (ee9ceb7)
• property accessor (bbca9de, bb22536)
• template literal (5d9224d)

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