DEV: Bump chunky_png from 1.3.11 to 1.3.12 (#10359)

Bumps [chunky_png](https://github.com/wvanbergen/chunky_png) from 1.3.11 to 1.3.12.
- [Release notes](https://github.com/wvanbergen/chunky_png/releases)
- [Changelog](https://github.com/wvanbergen/chunky_png/blob/master/CHANGELOG.rdoc)
- [Commits](https://github.com/wvanbergen/chunky_png/compare/v1.3.11...v1.3.12)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Gemfile.lock

@@ -81,7 +81,7 @@ GEM
     byebug (11.1.3)
     cbor (0.5.9.6)
     certified (1.0.0)
-    chunky_png (1.3.11)
+    chunky_png (1.3.12)
     coderay (1.1.3)
     colored2 (3.1.2)
     concurrent-ruby (1.1.6)