meson: bump submodule to 0.55.1

This version includes an important bugfix to avoid including unnecessary
-Wl,-rpath flags.  It also avoids the warnings on custom_targets with
more than one output.

Reported-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Tested-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

configure

@@ -2023,7 +2023,7 @@ python_version=$($python -c 'import sys; print("%d.%d.%d" % (sys.version_info[0]
 python="$python -B"
 
 if test -z "$meson"; then
-    if test "$explicit_python" = no && has meson && version_ge "$(meson --version)" 0.55.0; then
+    if test "$explicit_python" = no && has meson && version_ge "$(meson --version)" 0.55.1; then
         meson=meson
     elif test -e "${source_path}/.git" && test $git_update = 'yes' ; then
         meson=git

meson

@@ -1 +1 @@
-Subproject commit d0c68dc11507a47b9b85de508e023d9590d60565
+Subproject commit 68ed748f84f14c2d4e62dcbd123816e5898eb04c