main/gd: security upgrade to 2.3.0
Ref https://github.com/libgd/libgd/blob/gd-2.3.0/CHANGELOG.md#230---2020-03-22
- CVE-2019-11038
- CVE-2018-14553
usr/lib/libgd.so.3
-usr/lib/libgd.so.3.0.5
+usr/lib/libgd.so.3.0.8
Edited by Andy Postnikov
Ref https://github.com/libgd/libgd/blob/gd-2.3.0/CHANGELOG.md#230---2020-03-22
usr/lib/libgd.so.3
-usr/lib/libgd.so.3.0.5
+usr/lib/libgd.so.3.0.8