Bump version of libwxgtk (#48)

Author: alenajk

.github/workflows/test.yml

@@ -28,7 +28,7 @@ jobs:
           sudo apt-get update
           sudo apt-get install -y --no-install-recommends \
             libpoppler-glib-dev \
-            libwxgtk3.0-gtk3-dev
+            libwxgtk3.2-dev
 
           git clone https://github.com/vslavik/diff-pdf.git
           # v0.5.1