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.

chromium-widevine-helper-bin/.SRCINFO

@@ -21,7 +21,7 @@ pkgbase = chromium-widevine-helper-bin
 	backup = etc/opera/native-messaging-hosts/org.chromium.widevine.json
 	backup = etc/thorium/native-messaging-hosts/org.chromium.widevine.json
 	backup = etc/iridium/native-messaging-hosts/org.chromium.widevine.json
-	source = https://github.com/Felitendo/PKGBUILDS/releases/download/chromium-widevine-helper-bin-1.0.8/chromium-widevine-helper-bin-1.0.8.tar.zst
+	source = chromium-widevine-helper-bin-1.0.8-1.tar.zst::https://github.com/Felitendo/PKGBUILDS/releases/download/chromium-widevine-helper-bin-1.0.8/chromium-widevine-helper-bin-1.0.8.tar.zst
 	sha256sums = efb70f082652176710b403a2629333220c1b8b96e3f27f398ba7efb496982829
 
 pkgname = chromium-widevine-helper-bin

chromium-widevine-helper-bin/PKGBUILD

@@ -23,7 +23,7 @@ backup=('etc/helium/native-messaging-hosts/org.chromium.widevine.json'
         'etc/opera/native-messaging-hosts/org.chromium.widevine.json'
         'etc/thorium/native-messaging-hosts/org.chromium.widevine.json'
         'etc/iridium/native-messaging-hosts/org.chromium.widevine.json')
-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=('efb70f082652176710b403a2629333220c1b8b96e3f27f398ba7efb496982829')
 
 package() {