Update changelog for version 9

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Status Job ID Name Coverage
  Build
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doctest

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passed #365142
html

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passed #365145
latexpdf

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passed #365146
linkcheck

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passed #365147
spelling

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manual #365143
allowed to fail manual
stop review
passed #365141
validate-voevents

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  Deploy
passed #365148
pages

00:00:20

passed pages:deploy

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