chore(version): bump to 1.1.3

Patch. Fixes two Windows installer defects: an MSI upgrade no longer leaves
the app without libmpv until a second install (B62), and a taskbar pin keeps
its icon, which the exe now carries itself (B63). The catalog schema and
on-disk data are unchanged from 1.1.2.

packaging/PKGBUILD

@@ -14,7 +14,7 @@
 #     builds from the registry alone.
 
 pkgname=proton-stream
-pkgver=1.1.2
+pkgver=1.1.3
 pkgrel=1
 pkgdesc="Netflix-style desktop client for Proton Drive public links: browse and stream a share"
 arch=('x86_64')