fix download url

.drone.yml

@@ -11,7 +11,7 @@ steps:
     image: thegeeklab/rpmbuild:7
     commands:
       - source /drone/src/.drone.env
-      - wget -q https://github.com/OpenPrinting/cups/releases/download/$CUPS_VERSION/cups-$CUPS_VERSION-source.tar.gz
+      - wget -q https://github.com/OpenPrinting/cups/releases/download/$CUPS_VERSION/cups-${CUPS_VERSION##v}-source.tar.gz
       - rpmbuild -ta --without libusb1 cups-${CUPS_VERSION##v}-source.tar.gz
 
   - name: checksum
@@ -92,6 +92,6 @@ depends_on:
 
 ---
 kind: signature
-hmac: acd5875df015c9b10b95c26b65b1f53a7126438b5d71ba519411ce9d9754008f
+hmac: d8089ad4fcdd694f8d760e4eefda3ceda6c2c8a41e349cd83b5cf08bc60a1769
 
 ...