don't hardcode latest version

ci/compute-matrix.jq

@@ -14,8 +14,11 @@ def compute_ubuntu_version($x):
 def compute_cuda_tag($x):
   $x + {CUDA_TAG: $x.CUDA_VER | split(".") | [.[0], .[1]] | join(".") };
 
-def compute_build_raft_ann_bench_cpu_image($x):
-  $x + {BUILD_RAFT_ANN_BENCH_CPU_IMAGE: ($x.CUDA_VER == "12.5.1")}; # we don't need to build CPU packages for different CUDA versions.
+def latest_cuda_version($cuda_versions):
+  $cuda_versions | max_by(. | split(".") | map(tonumber));
+
+def compute_build_raft_ann_bench_cpu_image($x; $latest_cuda_version):
+  $x + {BUILD_RAFT_ANN_BENCH_CPU_IMAGE: ($x.CUDA_VER == $latest_cuda_version)}; # we don't need to build CPU packages for different CUDA versions
 
 # Checks the current entry to see if it matches the given exclude
 def matches($entry; $exclude):
@@ -35,12 +38,13 @@ def compute_matrix($input):
   keys_unsorted as $matrix_keys |
   to_entries |
   map(.value) |
+  latest_cuda_version($input.CUDA_VER) as $latest_cuda_version |
   [
     combinations |
     lists2dict($matrix_keys; .) |
     compute_ubuntu_version(.) |
     compute_cuda_tag(.) |
-    compute_build_raft_ann_bench_cpu_image(.) |
+    compute_build_raft_ann_bench_cpu_image(.; $latest_cuda_version) |
     filter_excludes(.; $excludes) |
     compute_arch(.)
   ] |