configure: require flux-security >= 0.14.0

Problem: sdexec now launches work in transient Type=notify
containers, but for that to work, a flux-security version
that calls sd_notify() is required.

Bump the minimum required version of flux-security.

Author: garlick

configure.ac

@@ -433,7 +433,7 @@ AS_IF([test x$enable_code_coverage = xyes], [
 AC_ARG_WITH([flux-security], AS_HELP_STRING([--with-flux-security],
              [Build with flux-security]))
 AS_IF([test "x$with_flux_security" = "xyes"], [
-    PKG_CHECK_MODULES([FLUX_SECURITY], [flux-security >= 0.13.0],
+    PKG_CHECK_MODULES([FLUX_SECURITY], [flux-security >= 0.14.0],
       [flux_sec_incdir=`$PKG_CONFIG --variable=includedir flux-security`])
     AS_IF([test "x$flux_sec_incdir" = x],
           [AC_MSG_ERROR([couldn't find flux-security include directory])])