GH Actions: bump to FreeBSD 14.3 (was 14.2)

According to https://www.freebsd.org/releases/, 14.3 is currently the
"Production" release and 14.2 is "Legacy".

Author: generalmimon

.github/workflows/build.yml

@@ -136,7 +136,7 @@ jobs:
       - name: Run in FreeBSD
         uses: vmactions/freebsd-vm@v1
         with:
-          release: "14.2"
+          release: "14.3"
           usesh: true
           prepare: |
             pkg install -y git cmake