chore(version): bump to 1.3.0

Minor. One new client: an iOS 17+ app, a SwiftUI port of the Android one
over the same Rust engine, published as an unsigned .ipa for SideStore and
AltStore. docs/IOS.md lists where iOS cannot follow Android: no
picture-in-picture, links come in through the protonstream:// scheme or
Paste link rather than the share sheet, and downloads run while the app
does.

No change to the Rust crates, the catalog schema or the desktop and Android
clients since 1.2.0.

packaging/PKGBUILD

@@ -14,7 +14,7 @@
 #     builds from the registry alone.
 
 pkgname=proton-stream
-pkgver=1.2.0
+pkgver=1.3.0
 pkgrel=1
 pkgdesc="Netflix-style desktop client for Proton Drive public links: browse and stream a share"
 arch=('x86_64')