opencv/2.x: use libpng version range, bump deps

[mayeut]

Specify library name and version: opencv/2.x

---

• I've read the contributing guidelines.
• I've used a recent Conan client version close to the currently deployed.
• I've tried at least one configuration locally with the conan-center hook activated.

[github-actions]

Hooks produced the following warnings for commit edbdbbf

opencv/2.4.13.7@#14a1afd5354efc3b44c77046d02acd47

post_package(): WARN: [MISSING SYSTEM LIBS (KB-H043)] Library '.\bin\opencv_highgui2413d.dll' links to system library 'msvfw32' but it is not in cpp_info.system_libs.
post_package(): WARN: [MISSING SYSTEM LIBS (KB-H043)] Library '.\bin\opencv_highgui2413d.dll' links to system library 'avifil32' but it is not in cpp_info.system_libs.
post_package(): WARN: [MISSING SYSTEM LIBS (KB-H043)] Library '.\bin\opencv_highgui2413.dll' links to system library 'msvfw32' but it is not in cpp_info.system_libs.
post_package(): WARN: [MISSING SYSTEM LIBS (KB-H043)] Library '.\bin\opencv_highgui2413.dll' links to system library 'avifil32' but it is not in cpp_info.system_libs.

[conan-center-bot]

🚦 Thank for your Bump dependencies PR. The build service will be triggered soon by a Conan team member.

[jcar87]

LGTM - apologies for the delay.
We've removed some Conan1-only logic and fixed the test package to support CMake 4.