pika: Add minimum CMake version requirement when using CUDA and C++20 (#47077)

var/spack/repos/builtin/packages/pika/package.py

@@ -117,6 +117,8 @@ class Pika(CMakePackage, CudaPackage, ROCmPackage):
     conflicts("%clang@:8", when="@0.2:")
     conflicts("+stdexec", when="cxxstd=17")
     conflicts("cxxstd=23", when="^cmake@:3.20.2")
+    conflicts("cxxstd=20", when="+cuda ^cmake@:3.25.1")
+    conflicts("cxxstd=23", when="+cuda")
     # nvcc version <= 11 does not support C++20 and newer
     for cxxstd in filter(lambda x: x != "17", cxxstds):
         requires("%nvhpc", when=f"cxxstd={cxxstd} ^cuda@:11")