Log Message:
Update to 0.12.12

Changelog:
Version 0.12.12
        GCrystal:
                * Fix atoms loading.
                * Fix infinite loop condition. [#36583]

Version 0.12.11
        GChemPaint:
                * fixed text position serialization. [#34947]
                * fixed crash when selecting the alignment item inside a mechanism
                step. [#35626]