Bump FreeBSD version to 13.4

Version 13.3 is EOL. See https://www.freebsd.org/releases/

Signed-off-by: Jan Rodák <[email protected]>

Author: Honny1

.cirrus.yml

@@ -322,7 +322,7 @@ freebsd_alt_build_task:
         TEST_FLAVOR: "altbuild"
         ALT_NAME: 'FreeBSD Cross'
     freebsd_instance:
-        image_family: freebsd-13-3
+        image_family: freebsd-13-4
     setup_script:
         - pkg install -y gpgme bash go-md2man gmake gsed gnugrep go pkgconf zstd
     build_amd64_script: