Address nightly failure in BSD kernel workflow

.github/workflows/bsdkm.yml

@@ -47,12 +47,13 @@ jobs:
     steps:
       - uses: actions/checkout@v5
 
-      # FreeBSD kernel code: BSD make, and kldload needs a real kernel. README.md
-      # says 14.2, but FreeBSD no longer serves it (only 14.3+), so run 14.3.
+      # FreeBSD kernel code: BSD make, and kldload needs a real kernel.
+      # kernel/bsdkm/README.md says 14.2, but the mirror only carries releases
+      # that are still supported, so run the current 14.x instead.
       - name: Build the module and load it in a FreeBSD VM
         uses: vmactions/freebsd-vm@v1
         with:
-          release: '14.3'
+          release: '14.5'
           usesh: true
           prepare: |
             pkg install -y git autoconf automake libtool
@@ -64,11 +65,19 @@ jobs:
             if [ ! -f /usr/src/sys/conf/kmod.mk ]; then
               # keyed off the running kernel, so this cannot drift from the VM
               rel=$(uname -r | sed 's/-p[0-9]*$//')
-              f=1; while :; do
-                fetch -o /tmp/src.txz "https://download.freebsd.org/releases/amd64/${rel}/src.txz" && break
-                [ "$f" -ge 5 ] && { echo "FAIL: src.txz fetch failed"; exit 1; }
-                f=$((f + 1)); sleep 10
+              # BSD moves old releases to the archive, so try both hosts
+              ok=0
+              for base in "https://download.freebsd.org/releases/amd64" \
+                          "https://archive.freebsd.org/old-releases/amd64"; do
+                f=1; while [ "$f" -le 3 ]; do
+                  if fetch -o /tmp/src.txz "$base/${rel}/src.txz"; then
+                    ok=1; break
+                  fi
+                  f=$((f + 1)); sleep 10
+                done
+                [ "$ok" -eq 1 ] && break
               done
+              [ "$ok" -eq 1 ] || { echo "FAIL: src.txz fetch failed"; exit 1; }
               tar -C / -xf /tmp/src.txz
             fi
             test -f /usr/src/sys/conf/kmod.mk