Include pkgrel in the local source filename

Artifact rebuilds (e.g. dependency bundling) change the file behind
<pkg>-<ver>.tar.zst while keeping its name, so users with the previous
file in their AUR helper cache hit a checksum mismatch. Naming the local
download <pkg>-<ver>-<rel>.tar.zst makes every rebuild a fresh file.

protonplus-bin/PKGBUILD

@@ -13,7 +13,7 @@ depends=('gtk4' 'json-glib' 'libadwaita' 'libarchive' 'libgee' 'libsoup3'
          'hicolor-icon-theme')
 provides=('protonplus')
 conflicts=('protonplus')
-source=("https://github.com/Felitendo/PKGBUILDS/releases/download/${pkgname}-${pkgver}/${pkgname}-${pkgver}.tar.zst")
+source=("${pkgname}-${pkgver}-${pkgrel}.tar.zst::https://github.com/Felitendo/PKGBUILDS/releases/download/${pkgname}-${pkgver}/${pkgname}-${pkgver}.tar.zst")
 sha256sums=('144992c7ad6a614cb05742ba2106cdc6a03329631fd64905932e11dd3636d7f2')
 
 package() {