Update changelog for 2.31-1 release

6 jobs for debian/2.31-1 in 39 minutes and 21 seconds (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Build
passed #143931
build

00:14:38

 
  Test
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autopkgtest

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passed #143935
blhc

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passed #143933
lintian

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passed #143936
piuparts

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passed #143932
reprotest

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