build(deps): update khronos-egl requirement from 5.0 to 6.0

Updates the requirements on [khronos-egl](https://github.com/timothee-haudebourg/khronos-egl) to permit the latest version.
- [Changelog](https://github.com/timothee-haudebourg/khronos-egl/blob/master/CHANGELOG.md)
- [Commits](timothee-haudebourg/khronos-egl@5.0.0...6.0.0)

---
updated-dependencies:
- dependency-name: khronos-egl
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

gdk4-wayland/Cargo.toml

@@ -33,7 +33,7 @@ glib = {git = "https://github.com/gtk-rs/gtk-rs-core", version = "0.19", feature
 libc = "0.2"
 wayland-client = {version = "0.30.0", optional = true}
 wayland-backend = {version = "0.1.0", optional = true, features = ["client_system"]}
-khronos-egl = {version = "5.0", optional = true}
+khronos-egl = {version = "6.0", optional = true}
 xkb = {version = "0.3", optional = true}
 
 [dev-dependencies]

gdk4-win32/Cargo.toml

@@ -29,7 +29,7 @@ win32 = ["windows"]
 
 [dependencies]
 libc = "0.2"
-khronos-egl = {version = "5.0", optional = true}
+khronos-egl = {version = "6.0", optional = true}
 windows = { version = "0.51", features = [
     "Win32_Foundation",
     "Win32_UI_WindowsAndMessaging",

gdk4-x11/Cargo.toml

@@ -29,7 +29,7 @@ gio = {git = "https://github.com/gtk-rs/gtk-rs-core", version = "0.19", features
 glib = {git = "https://github.com/gtk-rs/gtk-rs-core", version = "0.19", features = ["v2_66"]}
 libc = "0.2"
 x11 = {version = "2.20", optional = true }
-khronos-egl = {version = "5.0", optional = true}
+khronos-egl = {version = "6.0", optional = true}
 
 [dev-dependencies]
 gir-format-check = "^0.1"