feat(scripts): add Ubuntu LTS -updates releases to base-files JSON

Problem: armbian-base-files artifact build for Ubuntu LTS releases (jammy, noble)
fails because armbian-build looks for '{release}-updates' keys in base-files.json,
but only base release keys exist.

Root cause:
- armbian-build's apt-utils.sh uses 'jammy-updates' for LTS releases
- generate-base-files-info-json.py only adds base releases (jammy, noble)
- JSON lookup fails, artifact excluded from build matrix

Solution: Add -updates releases to the generation script
- Added 'ubuntu/jammy-updates' and 'ubuntu/noble-updates' to releases list
- Script now fetches latest security-updated versions from -updates repos

Benefits:
- Provides more recent base-files versions with security updates
- Fixes jammy/noble base-files artifact builds
- Allows jammy/noble images to build successfully
- Aligns with armbian-build's expectations

Versions:
- jammy: 12ubuntu4 -> 12ubuntu4.7 (from jammy-updates)
- noble: 13ubuntu10 -> 13ubuntu10.3 (from noble-updates)

This is the proper upstream fix. The fallback in armbian-build can remain
as a safety mechanism for when -updates keys are not available.

scripts/generate-base-files-info-json.py

@@ -267,6 +267,8 @@ if __name__ == "__main__":
     # Don't do this yet b/c jammy goes EOS Apr 2027, we don't know if we'll be ready.
     # also resolute isn't in changelog as of 2025Dec03
     releases += [ 'ubuntu/jammy', 'ubuntu/noble', 'ubuntu/plucky', 'ubuntu/questing', 'ubuntu/resolute' ]
+    # Add -updates repos for LTS releases to get latest security updates
+    releases += [ 'ubuntu/jammy-updates', 'ubuntu/noble-updates' ]
     release_hash = {}
     for release in releases:
         distro, release = release.split('/')