webkitgtk3: upgrade 2.48.7 -> 2.50.5

Includes fixes for CVE-2025-13502, CVE-2025-13947, CVE-2025-43421,
CVE-2025-43458 and CVE-2025-66287.

Drop libsoup2 support. Even though this particular version still supports
it, this is the last major version that is not libsoup3-only. Starting
with version 2.52 (which is only 3-4 weeks away at the time of writing this
message) upstream is dropping libsoup2 support completely[1].

This is a proactive removal of this feature, the sooner users start the
migration, the better.

Made opengl a mandatory DISTRO_FEATURE: libepoxy requires it, which is both
a direct dependency, and an indirect one from gtk+3.

Changelogs:
https://webkitgtk.org/2026/02/09/webkitgtk2.50.5-released.html
https://webkitgtk.org/2025/12/16/webkitgtk2.50.4-released.html
https://webkitgtk.org/2025/12/04/webkitgtk2.50.3-released.html
https://webkitgtk.org/2025/11/19/webkitgtk2.50.2-released.html
https://webkitgtk.org/2025/10/10/webkitgtk2.50.1-released.html
https://webkitgtk.org/2025/09/17/webkitgtk2.50.0-released.html

[1]: https://webkitgtk.org/2025/10/07/webkitgtk-soup2-deprecation.html

Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

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