ci: upgrade FreeBSD to 12.2

freebsd-vm@v0.0.7 uses FreeBSD 12.1 which has reached EOL on 2021-01-31.
FreeBSD Project doesn't keep old packages for /latest and /quarterly.
Once 12.2 packages are built there would be none for 12.1 except for
/release_1 which is more than 1 year old.
diff --git a/.github/workflows/freebsd.yml b/.github/workflows/freebsd.yml
index 35090a1..2b03be5 100644
--- a/.github/workflows/freebsd.yml
+++ b/.github/workflows/freebsd.yml
@@ -24,7 +24,7 @@
       with:
         path: libva-utils
     - name: test
-      uses: vmactions/freebsd-vm@v0.0.7
+      uses: vmactions/freebsd-vm@v0.1.2
       with:
         prepare: |
           pkg install -y meson pkgconf libdrm libXext libXfixes wayland