CI: Retire Fedora 40 builder

Fedora 40 has gone EOL as of May 2025, retire the CI builder.

Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #17408

.github/workflows/scripts/qemu-2-start.sh

@@ -61,11 +61,6 @@ case "$OS" in
     OSNAME="Debian 12"
     URL="https://cloud.debian.org/images/cloud/bookworm/latest/debian-12-generic-amd64.qcow2"
     ;;
-  fedora40)
-    OSNAME="Fedora 40"
-    OSv="fedora-unknown"
-    URL="https://download.fedoraproject.org/pub/fedora/linux/releases/40/Cloud/x86_64/images/Fedora-Cloud-Base-Generic.x86_64-40-1.14.qcow2"
-    ;;
   fedora41)
     OSNAME="Fedora 41"
     OSv="fedora-unknown"

.github/workflows/scripts/qemu-4-build-vm.sh

@@ -326,7 +326,7 @@ fi
 #
 # rhel8.10
 # almalinux9.5
-# fedora40
+# fedora42
 source /etc/os-release
 sudo hostname "$ID$VERSION_ID"