Add 7.4 branch

configure.ac

 AC_PREREQ([2.69])
-AC_COPYRIGHT([Copyright (c) 2019 UPLEX - Nils Goroll Systemoptimierung])
+AC_COPYRIGHT([Copyright 2019 - 2024 UPLEX - Nils Goroll Systemoptimierung])
 AC_INIT([libvdfp-pipe],[trunk],[varnish-support@uplex.de],[vdfp-pipe])
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_SRCDIR(src/vdfp_pipe.vcc)
@@ -53,7 +53,7 @@ AM_CONDITIONAL(HAVE_GENHTML, [test -n "$GENHTML"])
 
 m4_ifndef([VARNISH_PREREQ], AC_MSG_ERROR([Need varnish.m4 -- see README.rst]))
 
-VARNISH_PREREQ([7.4],[trunk])
+VARNISH_PREREQ([7.4],[7.5])
 VARNISH_VMODS([pipe])
 
 VMOD_TESTS="$(cd $srcdir/src && echo tests/*.vtc)"