gprofng: change use of bignum to use of bigint

Change the statement "use bignum" to "use bigint".  This is sufficient
for gp-display-html to work and removes the dependency on bignum.

gprofng/ChangeLog
2024-02-27  Ruud van der Pas  <ruud.vanderpas@oracle.com>

	PR 31390
	* gprofng/gp-display-html: One line change to "use bigint".

gprofng/gp-display-html/gp-display-html.in

@@ -25,7 +25,7 @@ use warnings;
 # Disable before release
 # use Perl::Critic;
 
-use bignum;
+use bigint;
 use List::Util qw (max);
 use Cwd qw (abs_path cwd);
 use File::Basename;