Update cuDNN requirement to 6.2.1

[dependabot]

Updates the requirements on cuDNN to permit the latest version.

Release notes

Sourced from cuDNN's releases.

v6.2.1

CUDA v6.2.1

Diff since v6.2.0

Merged pull requests:

• Update CI (#3175) (@​maleadt)
• Ignore patch in llvm and ptxas compat helpers (#3176) (@​AntonOresten)
• Bump GPUToolbox and remove the ability to reset devices (#3178) (@​maleadt)
• Add narrow-precision floats to cudaDataType (#3180) (@​AntonOresten)
• Bump actions/checkout from 6 to 7 (#3182) (@​dependabot[bot])
• Update to GPUToolbox v3. (#3183) (@​maleadt)
• Skip device-to-device copies of zero-byte arrays. (#3184) (@​maleadt)
• don't promote to i64 unnecessarily in unsafe_cached_load (#3186) (@​simeonschaub)
• Fix cluster barriers silently trapping on Julia <= 1.11 (#3188) (@​AntonOresten)
• Implementing specialized coo_type for CuSparseCOO (#3190) (@​alonsoC1s)

Closed issues:

• rCuFFTPlan not defined (#2509)
• Julia 1.12: Switch to Once (#2544)
• Norm of Hermitian matrices trigger scalar indexing error (#2965)
• LLVM 18 / Julia 1.12: Invalid vectorization leads to ptxas error (#3036)
• LLVM 20 / Julia 1.13: Back-end crash during texture tests (#3037)
• CUDACore - warning during precompilation (#3177)
• Error on CUDA.rand(RGB{Float32}, ...) in CUDA.jl 6.1 and 6.2 (#3179)
• deepcopy fails for CuArray with zero-size element type (#3181)
• Calling findnz(A) with a COO-formatted argument causes a stack overflow (#3189)

Commits

• 2816631 Bump version.
• 1b62bc2 Fix cluster barriers silently trapping on Julia <= 1.11 (#3188)
• 5886f9d Implementing specialized coo_type for CuSparseCOO (#3190)
• 8c6af3b Add narrow-precision floats to cudaDataType (#3180)
• ae647ae Don't promote to i64 unnecessarily in unsafe_cached_load (#3186)
• fbb9098 Skip device-to-device copies of zero-byte arrays. (#3184)
• 9dc5657 Update to GPUToolbox v3. (#3183)
• f4a33a2 Bump actions/checkout from 6 to 7 (#3182)
• bc81d40 Bump GPUToolbox and remove the ability to reset devices (#3178)
• f36a98c Ignore patch versions in LLVM and ptxas compatibility queries (#3176)
• Additional commits viewable in compare view

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