[librsvg] (3 commits) ...Merge branch 'prepare-release' into 'master'

From: Federico Mena Quintero <federico src gnome org>
To: commits-list gnome org
Cc:
Subject: [librsvg] (3 commits) ...Merge branch 'prepare-release' into 'master'
Date: Wed, 26 May 2021 17:53:47 +0000 (UTC)

Summary of changes:

  3a4eee2... Bump version to 2.51.2
  3096647... Update NEWS
  4d86524... Merge branch 'prepare-release' into 'master'