use cudnn 9.10 migration

Author: h-vetinari

.ci_support/migrations/cuda129.yaml

@@ -50,6 +50,9 @@ cuda_compiler_version:         # [((linux and (x86_64 or aarch64)) or win64) and
 cuda_compiler_version_min:     # [((linux and (x86_64 or aarch64)) or win64) and os.environ.get("CF_CUDA_ENABLED", "False") == "True"]
   - 12.9                       # [((linux and (x86_64 or aarch64)) or win64) and os.environ.get("CF_CUDA_ENABLED", "False") == "True"]
 
+cudnn:                         # [((linux and (x86_64 or aarch64)) or win64) and os.environ.get("CF_CUDA_ENABLED", "False") == "True"]
+  - 9                          # [((linux and (x86_64 or aarch64)) or win64) and os.environ.get("CF_CUDA_ENABLED", "False") == "True"]
+
 c_stdlib_version:              # [(linux and (x86_64 or aarch64)) and os.environ.get("CF_CUDA_ENABLED", "False") == "True"]
   - 2.17                       # [(linux and (x86_64 or aarch64)) and os.environ.get("CF_CUDA_ENABLED", "False") == "True"]
 

.ci_support/migrations/cudnn910.yaml

@@ -0,0 +1,34 @@
+# needs to be ordered before CUDA 13.0 migrator
+migrator_ts: 1755016000
+__migrator:
+  kind:
+    version
+  migration_number:
+    1
+  build_number:
+    1
+  ordering:
+    cudnn:
+      - None
+      - 9
+      - 9.10
+  commit_message: |
+    Rebuild for cudnn 9.10
+    
+    Conda-forge assumed cudnn 9.x builds would stay compatible with each other.
+    This is the case for the API/ABI of the library, but nvidia dropped support
+    for older GPU architectures in cudnn 9.11. Since we have no package-level
+    metadata about compatibility with specific GPU architectures, this effectively
+    breaks all packages built atop cudnn for users on affected older GPUs.
+    
+    In order to remedy this situation, we need to rebuild all cudnn-dependent
+    feedstocks against cudnn 9.10 (the last version with full architecture support),
+    before we mark all those newer cudnn builds as broken. This only affects artefacts
+    for CUDA 12.x; those for CUDA 13.x are not affected, since CUDA 13 never supported
+    those older architectures in the first place.
+    
+    For more details see: https://github.com/conda-forge/cudnn-feedstock/issues/124
+
+cudnn:
+  - None
+  - 9.10                       # [((linux and not ppc64le) or win64) and os.environ.get("CF_CUDA_ENABLED", "False") == "True"]