add news item for ikiwiki 2.31.2

diff --git a/doc/news/version_2.31.2.mdwn b/doc/news/version_2.31.2.mdwn
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+ikiwiki 2.31.2 released with [[toggle text="these changes"]]
+[[toggleable text="""
+   * The security fix in the last release had buggy handling of data:image,
+     now fixed."""]]
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