Use version 0.2.1

Author: tpadioleau

Diff for: CMakeLists.txt

@@ -173,7 +173,7 @@ if("${DDC_BUILD_KERNELS_FFT}")
 
   if("${DDC_KokkosFFT_DEPENDENCY_POLICY}" STREQUAL "AUTO")
     if(NOT TARGET KokkosFFT::fft)
-      find_package(KokkosFFT 0.2 CONFIG QUIET)
+      find_package(KokkosFFT 0.2.1...<2 CONFIG QUIET)
       if(NOT KokkosFFT_FOUND)
         option(KokkosFFT_ENABLE_HOST_AND_DEVICE "Enable FFT on both host and device" ON)
         add_subdirectory(vendor/kokkos-fft)
@@ -183,7 +183,7 @@ if("${DDC_BUILD_KERNELS_FFT}")
     option(KokkosFFT_ENABLE_HOST_AND_DEVICE "Enable FFT on both host and device" ON)
     add_subdirectory(vendor/kokkos-fft)
   elseif("${DDC_KokkosFFT_DEPENDENCY_POLICY}" STREQUAL "INSTALLED")
-    find_package(KokkosFFT 0.2 CONFIG REQUIRED)
+    find_package(KokkosFFT 0.2.1...<2 CONFIG REQUIRED)
   endif()
 
   target_link_libraries(DDC INTERFACE KokkosFFT::fft)

Diff for: cmake/DDCConfig.cmake.in

@@ -7,7 +7,7 @@
 include(CMakeFindDependencyMacro)
 
 if(@DDC_BUILD_KERNELS_FFT@)
-   find_dependency(KokkosFFT 0.2 CONFIG REQUIRED)
+   find_dependency(KokkosFFT 0.2.1...<2 CONFIG)
 endif()
 
 if(@DDC_BUILD_PDI_WRAPPER@)