[gexiv2] Created tag gexiv2-0.12.3

[Jens Georg <jensgeorg src gnome org>]

The signed tag 'gexiv2-0.12.3' was created.

Tagger: Jens Georg <mail jensge org>
Date: 1629062990 +0200

    Release GExiv2 0.12.3

Changes since the last tag 'gexiv2-0.12.2':

Jens Georg (6):
      startup: Only try to enable BMFF support if available
      Fix compilation against gexiv2 mainline
      ci: Sync with master
      ci: Move to GNOME sdk 40
      build: Add check for BMFF support
      Prepare 0.12.3

Peter Kovář (1):
      Add BMFF support

postscript-dev (5):
      Update postscript-dev email address
      Fix gtk-doc nullptr annotations - replace with NULL
      Add missing funcs in testing expected_methods()
      Add catch clauses for `WError` exceptions
      Mark gexiv2_metadata_from_stream() as deprecated