Update package version to 1.6.59

info.yml

@@ -1,7 +1,7 @@
 name: libpng
 description: PNG formatted image file manipulation library
-version: 1.6.58
-revision: 2
+version: 1.6.59
+revision: 1
 url: http://www.libpng.org/pub/png/libpng.html
 license: custom
 maintainers:
@@ -15,4 +15,4 @@ downloads:
   - url: https://github.com/pnggroup/libpng/archive/refs/tags/v${BPM_PKG_VERSION}.tar.gz
     extract_to: ${BPM_SOURCE}
     extract_strip_components: 1
-    checksum: a9d4df463d36a6e5f9c29bd6f4967312d17e996c1854f3511f833924eb1993cf
+    checksum: 2540302a1844ad2b2b501977abecfa850f265f97b78f065a712ab4074a89f5b5