Use GCC 13 in CUDA 12 conda builds. (#1102)

conda-forge is using GCC 13 for CUDA 12 builds. This PR updates CUDA 12 conda builds to use GCC 13, for alignment.

These PRs should be merged in a specific order, see rapidsai/build-planning#129 for details.

Authors:
  - Bradley Dice (https://github.com/bdice)

Approvers:
  - James Lamb (https://github.com/jameslamb)

URL: #1102

conda/recipes/ucx-py/conda_build_config.yaml

@@ -1,7 +1,9 @@
 c_compiler_version:
-  - 11
+  - 13  # [not os.environ.get("RAPIDS_CUDA_VERSION", "").startswith("11")]
+  - 11  # [os.environ.get("RAPIDS_CUDA_VERSION", "").startswith("11")]
 cxx_compiler_version:
-  - 11
+  - 13  # [not os.environ.get("RAPIDS_CUDA_VERSION", "").startswith("11")]
+  - 11  # [os.environ.get("RAPIDS_CUDA_VERSION", "").startswith("11")]
 
 ucx:
   - "==1.15.*"