Bug#1031809: Bump webp-pixbuf-loader version to 0.1.2 as it contains important bugfixes

[Nikolay Kyx]

Package: webp-pixbuf-loader
Version: 0.0.5-5
Severity: serious

Steps to reproduce:
1. Install gpicview.
2. Skip through webp images (cycling between 2 is sufficient) and
monitor its RAM consumption.
3. Consider updating to latest tag
https://github.com/aruiz/webp-pixbuf-loader/releases