Bug#1103716: kasts: FTBFS on all architectures

[Chris Hofstaedtler <zeha@debian.org>]

Source: kasts
Version: 25.04.0-1
Severity: serious
Tags: ftbfs

Example build log:
https://buildd.debian.org/status/fetch.php?pkg=kasts&arch=arm64&ver=25.04.0-1&stamp=1745138731&raw=0

...
-- Found KF6Kirigami: /usr/lib/aarch64-linux-gnu/cmake/KF6Kirigami/KF6KirigamiConfig.cmake (found version "6.13.0")
-- Found KF6Syndication: /usr/lib/aarch64-linux-gnu/cmake/KF6Syndication/KF6SyndicationConfig.cmake (found version "6.13.0")
-- Found KF6Config: /usr/lib/aarch64-linux-gnu/cmake/KF6Config/KF6ConfigConfig.cmake (found version "6.13.0")
-- Found KF6ThreadWeaver: /usr/lib/aarch64-linux-gnu/cmake/KF6ThreadWeaver/KF6ThreadWeaverConfig.cmake (found version "6.13.0")
-- Found KF6ColorScheme: /usr/lib/aarch64-linux-gnu/cmake/KF6ColorScheme/KF6ColorSchemeConfig.cmake (found version "6.13.0")
-- Could NOT find KF6IconThemes (missing: KF6IconThemes_DIR)
-- Could NOT find KF6IconThemes: found neither KF6IconThemesConfig.cmake nor kf6iconthemes-config.cmake 
CMake Error at /usr/share/cmake-3.31/Modules/FindPackageHandleStandardArgs.cmake:233 (message):
  Could NOT find KF6 (missing: IconThemes) (found suitable version "6.13.0",
  minimum required is "6.5.0")

      Reason given by package: Missing the following required components: IconThemes

Call Stack (most recent call first):
  /usr/share/cmake-3.31/Modules/FindPackageHandleStandardArgs.cmake:603 (_FPHSA_FAILURE_MESSAGE)
  /usr/share/ECM/find-modules/FindKF6.cmake:98 (find_package_handle_standard_args)
  CMakeLists.txt:58 (find_package)


-- Configuring incomplete, errors occurred!