ANNOUNCE: xfce4-dev-tools 4.21.1 released

[Gaël Bonithon]

xfce4-dev-tools 4.21.1 is now available for download from
  
  https://archive.xfce.org/src/xfce/xfce4-dev-tools/4.21/xfce4-dev-tools-4.21.1.tar.bz2
  https://archive.xfce.org/src/xfce/xfce4-dev-tools/4.21/xfce4-dev-tools-4.21.1.tar.bz2?sha1
  https://archive.xfce.org/src/xfce/xfce4-dev-tools/4.21/xfce4-dev-tools-4.21.1.tar.bz2?sha256


What is xfce4-dev-tools?
========================

The Xfce Development Tools are a set of scripts and m4/autoconf macros
that ease build system maintenance.

Website: 
  https://docs.xfce.org/xfce/xfce4-dev-tools/start


Release notes for 4.21.1
========================
[Please note that this is a development release.]

- Update copyright year
- Add rust & xfwl4 deps
- ci: Make cppcheck cfg prefix configurable
- ci: scan-build related updates after switching to ubuntu 26.04
- ci: gcc-analyzer related updates after switching to ubuntu 26.04
- ci: Add cppcheck job
- Upgrade xfce-build container to Ubuntu 26.04 LTS
- xfce-build: add libxkbregistry-dev to container
- Update docker/docker-dind images for CI
- doc: Update developer.xfce.org index
- gst-plugin-gtk: New dependency for video wallpapers in xfdesktop
- meson: Fix typo in optimization level
- ci: Add docbook-xml to CI build
- ci: Add libpam0g-dev to CI build
- ci: Add libsystemd-dev, xmlto to CI build
- ci: Add libgexiv2-dev to CI build