github/workflows: use cross-platform-actions for freebsd

Since vmactions is basically a bootlooping disaster with no signs of
life from upstream, let's try a different action instead and hope it
works better.

.github/workflows/build.yml

@@ -172,16 +172,14 @@ jobs:
 
   freebsd:
     runs-on: macos-12 # until https://github.com/actions/runner/issues/385
-    timeout-minutes: 20 # randomly bootloops https://github.com/vmactions/freebsd-vm/issues/74
     steps:
     - uses: actions/checkout@v3
     - name: Test in FreeBSD VM
-      uses: vmactions/freebsd-vm@v0
+      uses: cross-platform-actions/action@v0.19.1
       with:
-        mem: 8192
-        copyback: false
-        usesh: true
-        prepare: |
+        operating_system: freebsd
+        version: '13.2'
+        run: |
             # Update to latest release channel
             mkdir -p /usr/local/etc/pkg/repos
             echo "FreeBSD: { url: "pkg+http://pkg.freebsd.org/\${ABI}/latest" }" \
@@ -225,7 +223,6 @@ jobs:
                 uchardet \
                 v4l_compat \
                 #
-        run: |
           ./ci/build-freebsd.sh
           meson test -C build