Merge version 1.6.56-1+rpi1 and 1.6.58-1 to produce 1.6.58-1+rpi1

diff --cc debian/changelog
index a1aad650f46df0cf0ae8dd1560b06557d7386db3,7689de469548a445c16dd9bc2e3ccde53994a0b8..588583378dfd5ec00ca9f986333bf1d45e3d3235
--- 1/debian/changelog
--- 2/debian/changelog
+++ b/debian/changelog
@@@ -1,8 -1,16 +1,23 @@@
- libpng1.6 (1.6.56-1+rpi1) forky-staging; urgency=medium
++libpng1.6 (1.6.58-1+rpi1) forky-staging; urgency=medium
 +
++  [changes brought forward from 1.6.56-1+rpi1 by Peter Michael Green <plugwash@raspbian.org> at Thu, 09 Apr 2026 17:51:00 +0000]
 +  * Disable neon.
 +
-  -- Peter Michael Green <plugwash@raspbian.org>  Thu, 09 Apr 2026 17:51:00 +0000
++ -- Raspbian forward porter <root@raspbian.org>  Thu, 30 Apr 2026 04:34:03 +0000
++
+ libpng1.6 (1.6.58-1) unstable; urgency=medium
+ 
+   * New upstream version 1.6.58
+     - Fix regression in 1.6.57
+ 
+  -- Gianfranco Costamagna <locutusofborg@debian.org>  Fri, 17 Apr 2026 14:34:10 +0200
+ 
+ libpng1.6 (1.6.57-1) unstable; urgency=medium
+ 
+   * New upstream version 1.6.57
+     - CVE-2026-34757 - heap information disclosure (Closes: #1133051)
+ 
+  -- Gianfranco Costamagna <locutusofborg@debian.org>  Sun, 12 Apr 2026 18:08:25 +0200
  
  libpng1.6 (1.6.56-1) unstable; urgency=high