chore: bump wiiu-env/devkitppc from 20250608 to 20260504

Bumps wiiu-env/devkitppc from 20250608 to 20260504.

---
updated-dependencies:
- dependency-name: wiiu-env/devkitppc
  dependency-version: '20260504'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Dockerfile

@@ -1,4 +1,4 @@
-FROM ghcr.io/wiiu-env/devkitppc:20250608
+FROM ghcr.io/wiiu-env/devkitppc:20260504
 
 COPY --from=ghcr.io/wiiu-env/libnotifications:20240426  /artifacts $DEVKITPRO
 COPY --from=ghcr.io/wiiu-env/libfunctionpatcher:20230621 /artifacts $DEVKITPRO