Update changelog for 0.6.2-4 release

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  Build
passed #404188
build

00:03:04

 
  Test
passed #404193
autopkgtest

00:02:58

passed #404194
blhc

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passed #404192
allowed to fail
lintian

00:01:29

passed #404195
piuparts

00:03:09

passed #404191
reprotest

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passed #404190
test-build-all

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passed #404189
test-build-any

00:02:04