Upgrade glad version

[JuanDiegoMontoya]

so newer functions can be tested

I suggest a 4.6 compat profile header with ARB_bindless_texture (debug mode of course)

https://gen.glad.sh/#generator=c&api=gl%3D4.6&profile=gl%3Dcompatibility%2Cgles1%3Dcommon&extensions=GL_ARB_bindless_texture&options=DEBUG

Suggestions for ubiquitous extensions that are widely used would be helpful.

[NotAPenguin0]

I already have an updated glad (without extensions) in #6, but I agree with ARB_bindless_texture is good to have