UCX: make version support level more realistic (#36127)

Per feedback from the UCX community, we rarely do update
releases to anything but the current and one previous main
release stream.

Update comments in the UCX spack file to reflect this.

Signed-off-by: Howard Pritchard <howardp@lanl.gov>

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

@@ -19,8 +19,12 @@ class Ucx(AutotoolsPackage, CudaPackage):
 
     # Current
     version("1.14.0", sha256="9bd95e2059de5dece9dddd049aacfca3d21bfca025748a6a0b1be4486e28afdd")
+
+    # Still supported
     version("1.13.1", sha256="efc37829b68e131d2acc82a3fd4334bfd611156a756837ffeb650ab9a9dd3828")
     version("1.13.0", sha256="8a3881f21fe2788113789f5bae1c8174e931f7542de0a934322a96ef354e5e3d")
+
+    # Retired
     version("1.12.1", sha256="40b447c8e7da94a253f2828001b2d76021eb4ad39647107d433d62d61e18ae8e")
     version("1.12.0", sha256="93e994de2d1a4df32381ea92ba4c98a249010d1720eb0f6110dc72c9a7d25db6")
     version("1.11.2", sha256="deebf86a5344fc2bd9e55449f88c650c4514928592807c9bc6fe4190e516c6df")
@@ -39,8 +43,6 @@ class Ucx(AutotoolsPackage, CudaPackage):
     version("1.5.1", sha256="567119cd80ad2ae6968ecaa4bd1d2a80afadd037ccc988740f668de10d2fdb7e")
     version("1.5.0", sha256="84f6e4fa5740afebb9b1c8bb405c07206e58c56f83120dcfcd8dc89e4b7d7458")
     version("1.4.0", sha256="99891a98476bcadc6ac4ef9c9f083bc6ffb188a96b3c3bc89c8bbca64de2c76e")
-
-    # Still supported
     version("1.3.1", sha256="e058c8ec830d2f50d9db1e3aaaee105cd2ad6c1e6df20ae58b9b4179de7a8992")
     version("1.3.0", sha256="71e69e6d78a4950cc5a1edcbe59bf7a8f8e38d59c9f823109853927c4d442952")
     version("1.2.2", sha256="914d10fee8f970d4fb286079dd656cf8a260ec7d724d5f751b3109ed32a6da63")