package/perl-gdgraph: bump to version 1.56

diff README: update AUTHOR section
    see https://metacpan.org/release/BPS/GDGraph-1.56/diff/RUZ/GDGraph-1.54#README

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/perl-gdgraph/perl-gdgraph.hash

@@ -1,7 +1,7 @@
-# retrieved by scancpan from http://cpan.metacpan.org/
-md5  38c6a188519e6272e9b2b722b315c3d8  GDGraph-1.54.tar.gz
-sha256  b96f5c10b656c17d16ab65a1777c908297b028d3b6815f6d54b2337f006bfa4f  GDGraph-1.54.tar.gz
+# retrieved by scancpan from https://cpan.metacpan.org/
+md5  4ed2187e4f59c2bfb0392fb407a59d13  GDGraph-1.56.tar.gz
+sha256  6f49cc4e59015480db9c9b6b18afd8c50be30886687b69411513d06f38971113  GDGraph-1.56.tar.gz
 
 # Hash for license files
 sha256  710484e3a1196664bbe8a5ad5d53c528e01226eb20e2885a4e1131eb6c6565cd  Dustismo.LICENSE
-sha256  f44630ad9101e40a101d906a07908c975a9b0742273cfb0c00a51d73afb53e7d  README
+sha256  a343db34e71a251a14209957c89add8fd1bc62c34aa3c3818d1b474635c11754  README

package/perl-gdgraph/perl-gdgraph.mk

@@ -4,9 +4,9 @@
 #
 ################################################################################
 
-PERL_GDGRAPH_VERSION = 1.54
+PERL_GDGRAPH_VERSION = 1.56
 PERL_GDGRAPH_SOURCE = GDGraph-$(PERL_GDGRAPH_VERSION).tar.gz
-PERL_GDGRAPH_SITE = $(BR2_CPAN_MIRROR)/authors/id/R/RU/RUZ
+PERL_GDGRAPH_SITE = $(BR2_CPAN_MIRROR)/authors/id/B/BP/BPS
 PERL_GDGRAPH_LICENSE = Artistic or GPL-1.0+ (perl module), GPL-2.0+ (font)
 PERL_GDGRAPH_LICENSE_FILES = Dustismo.LICENSE README
 PERL_GDGRAPH_DISTNAME = GDGraph