As implemented, we only support OpenGL 3 API from version 3.2. Though, there is no issue enabling GLSL 1.30 even if we are going to restrict our API usage to 2. This allows using texelFetch() on OpenGL 3.0 and 3.1 drivers. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2190>