Update PowerPC and Sparc kernels.

Author: reitermarkus

docker/linux-image.sh

@@ -54,7 +54,7 @@ main() {
             # there is no stable port
             arch=ppc64
             # https://packages.debian.org/en/sid/linux-image-powerpc64
-            kernel=5.4.0-3-powerpc64
+            kernel=5.4.0-4-powerpc64
             debsource="deb http://ftp.ports.debian.org/debian-ports unreleased main"
             debsource="$debsource\ndeb http://ftp.ports.debian.org/debian-ports unstable main"
             # sid version of dropbear requires these dependencies
@@ -71,7 +71,7 @@ main() {
         sparc64)
             # there is no stable port
             # https://packages.debian.org/en/sid/linux-image-sparc64
-            kernel=5.4.0-3-sparc64
+            kernel=5.4.0-4-sparc64
             debsource="deb http://ftp.ports.debian.org/debian-ports unreleased main"
             debsource="$debsource\ndeb http://ftp.ports.debian.org/debian-ports unstable main"
             # sid version of dropbear requires these dependencies