chore: bump LLVM commit hash to dd7a3d4 #2697

Job	Run time
Generate Test Matrix	1m 12s
Generate Test Matrix	1m 12s
Apple-Clang	48m 30s
Apple-Clang	48m 30s
Clang 18: C++20	1h 47m 49s
Clang 18: C++20	1h 47m 49s
MSVC ^14.40: C++20	2h 4m 23s
MSVC ^14.40: C++20	2h 4m 23s
GCC 14: C++20	1h 35m 47s
GCC 14: C++20	1h 35m 47s
MSVC ^14.40: C++20 (Optimized-Debug)	2h 10m 3s
MSVC ^14.40: C++20 (Optimized-Debug)	2h 10m 3s
GCC 14: C++20 (Coverage)	1h 38m 58s
GCC 14: C++20 (Coverage)	1h 38m 58s
macOS MrDocs Releases	1m 36s
macOS MrDocs Releases	1m 36s
Apple-Clang LLVM Release	2m 7s
Apple-Clang LLVM Release	2m 7s
Linux MrDocs Releases	50s
Linux MrDocs Releases	52s
Clang 18: C++20 LLVM Release	3m 16s
Clang 18: C++20 LLVM Release	3m 16s
Windows MrDocs Releases	3m 46s
Windows MrDocs Releases	3m 46s
MSVC ^14.40: C++20 LLVM Release	9m 15s
MSVC ^14.40: C++20 LLVM Release	9m 15s
MSVC ^14.40: C++20 (Optimized-Debug) LLVM Release	9m 30s
MSVC ^14.40: C++20 (Optimized-Debug) LLVM Release	9m 30s
	21h 14m 6s

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